Within Metadata
The two codes behind every paid song
Recording and composition identifiers solve different payment problems, and royalties break down when the two sides are not connected.
On this page
- What recording identifiers do
- What composition identifiers do
- Where the recording to work link fails
Page outline Jump by section
Introduction
A song can generate two different streams of royalties at the same time: one for the sound recording and another for the underlying composition. The recording is identified by an ISRC (International Standard Recording Code), while the composition is identified by an ISWC (International Standard Musical Work Code). On their own, both codes are useful. The crucial payment mechanism is the link between them. When databases can connect a recording’s ISRC to the correct composition’s ISWC, royalties can be routed to labels, performers, songwriters and publishers. When that connection is missing, incomplete or disputed, money can be delayed, held for research, or distributed incorrectly. IFPI [ISWC]iswc.orgISWCThe ISWCThe ISWC identifies musical works, not their manifestations, objects, or expressions (e.g. publications, broadcasts…). The…
The two codes behind every paid song
The music industry treats recordings and compositions as separate assets because they represent different rights.
An ISRC identifies a specific sound recording or music video. It follows the recording throughout its life, regardless of format or release configuration. A remaster, remix or alternate version may require a different ISRC because it is a different recording. The code is designed to identify the master recording, not the song itself. IFPI [2ifpi-isrc]isrc.ifpi.orgifpi-isrcWhen Not To AssignISRC is used to identify sound recordings and music videos only. ISRC should not be used to identify other ite…
An ISWC identifies the musical work: the melody, lyrics and composition that exist independently of any particular recording. One song can have a single ISWC even when it has dozens of recordings by different artists. The ISWC is used by collective management organisations and publishers to identify the work and help allocate songwriter and publisher royalties. [ASCAP]ascap.comiswc number work codes faqAll About ISWCs and How They Can Help You Get Paid18 Nov 2023 — The International Standard Musical Work Code (ISWC) is a unique, permanen… [ISWC]iswc.orgISWCThe ISWCThe ISWC identifies musical works, not their manifestations, objects, or expressions (e.g. publications, broadcasts…). The… [The ISWC]iswc.orgISWCThe ISWCThe ISWC identifies musical works, not their manifestations, objects, or expressions (e.g. publications, broadcasts…). The… distinction matters because listeners hear recordings, but many royalty systems ultimately need to pay both recording owners and composition owners. The two identifiers solve different problems in the same payment chain. [CISAC]cisac.orgCISACInternational IdentifiersThe ISWC identifies musical works by reference to the title of a work and its creators (including composers…
What recording identifiers do
When a stream, download, broadcast or other use is reported, the recording side of the industry usually begins with the ISRC.
Streaming platforms, distributors, labels, neighbouring-rights organisations and many reporting systems use the ISRC to determine which recording was used. Because each recording has its own code, usage data can be aggregated accurately across services and territories. Missing or invalid ISRCs can create significant royalty-tracking problems and payment delays. [WIN]winformusic.orgwin unveils isrc factsheetWINWIN unveils ISRC Factsheet to educate about its importance …28 Jun 2023 — Missing, invalid or duplicate ISRCs can lead to significan… [Aria]aria.com.auISRCEach ISRC is a unique and permanent identifier for a specific recording which can be permanently encoded into a product as its digita…
Consider a familiar song recorded by multiple artists. Each recording receives its own ISRC because each recording has different performers, recording owners and commercial histories. The ISRC answers the question: “Which recording generated this revenue?” [blog.songtrust.com]blog.songtrust.comSong Registration Tips | What's the Difference: ISRC vs ISWC6 Apr 2020 — An ISWC can be linked to any number of ISRCs, while each ISRC is…
What it does not answer is: “Which composition sits underneath that recording?” That requires a different identifier and a link between the two datasets. [ifpi-isrc]isrc.ifpi.orgifpi-isrcWhen Not To AssignISRC is used to identify sound recordings and music videos only. ISRC should not be used to identify other ite…
What composition identifiers do
The ISWC operates on the publishing side of music rights.
Instead of identifying a recording session or master file, it identifies the composition itself and connects that work to songwriter and publisher information. The code helps distinguish one musical work from another, even when titles are similar or identical. It also allows societies around the world to recognise the same composition when collecting and distributing royalties internationally. [APRA AMCOS]apraamcos.co.nzwhat is an iswc and how does it help get you paidAPRA AMCOSWhat is an ISWC and how does it help get you paid?26 Mar 2024 — The ISWC (International Standard Musical Work Code) is a unique… [Queen Mary]qmul.ac.ukinternational standard musical work code11 Sept 2023 —… ISWC is the international standard identifier for musical works. Every time a song is written by a composer and is reg… University of London
A useful way to think about the system is that a composition may have many recordings. A classic song might be released as an original studio recording, a live version, a cover version, an acoustic version and several remixes. Each recording can have its own ISRC, but they may all point back to the same ISWC if they use the same underlying composition. [blog.songtrust.com]blog.songtrust.comSong Registration Tips | What's the Difference: ISRC vs ISWC6 Apr 2020 — An ISWC can be linked to any number of ISRCs, while each ISRC is… [muzisecur]muzisecur.frisrc code complete guideISRC Code: Complete Guide for Music17 Mar 2026 — The ISRC identifies the sound recording (the master), while the ISWC identifies the musi… This structure allows songwriter royalties to follow the composition regardless of which recording generated the usage.[CISAC]
Where the recording-to-work link fails
The most important payment step is not assigning an ISRC or assigning an ISWC. It is connecting them correctly.
A streaming service can know exactly which recording was played because it has the ISRC. Yet publishing royalties still require identification of the corresponding musical work. If the recording metadata does not connect to the correct ISWC and associated ownership information, the publishing side cannot be paid automatically. [CISAC]cisac.orgnew improved music identifier will help creators all important digitalCISACNew improved music identifier will help creators in the all-…24 Sept 2020 — A two-year project to modernise the global ISWC syste…
Several common failure points appear across the industry:
- Recording delivered before composition data is complete. New releases often reach services before all songwriter registrations are finalised.
- Multiple claims for the same work. Conflicting ownership information can prevent automated matching.
- Missing identifiers. A recording may have an ISRC but no reliable connection to a registered work.
- Duplicate or incorrect metadata. Different databases may contain inconsistent information about the same song. [arXiv]arxiv.orgarXiv Towards an Open and Scalable Music Metadata LayerarXiv Towards an Open and Scalable Music Metadata Layer
When these failures occur, royalty administrators may move funds into suspense accounts, hold payments pending research, or rely on manual matching processes. The result is slower and less accurate royalty distribution. [arXiv]arxiv.orgarXiv Towards an Open and Scalable Music Metadata LayerarXiv Towards an Open and Scalable Music Metadata Layer
Why the link matters more than either code alone
Neither identifier was designed to replace the other.
The ISRC identifies a recording but cannot identify the composition behind it. The ISWC identifies a composition but cannot identify every recording that uses it. The royalty system becomes efficient only when both identifiers are connected through reliable metadata. [ifpi-isrc]isrc.ifpi.orgifpi-isrcWhen Not To AssignISRC is used to identify sound recordings and music videos only. ISRC should not be used to identify other ite… [CISAC]iswcnet.cisac.orgcisac.orgISWC: PortalThe ISWC (International Standard Musical Work Code) is a unique, permanent and internationally recognized reference…
In practical terms, the ISRC tells the industry what was played, while the ISWC helps determine who wrote it and who should receive publishing income. The link between them is the bridge that allows usage data to become royalty payments. Without that bridge, even perfectly tracked listening activity can fail to reach the correct songwriter, publisher, performer or rights owner. CISAC [Queen Mary University of London]qmul.ac.ukinternational standard musical work code11 Sept 2023 —… ISWC is the international standard identifier for musical works. Every time a song is written by a composer and is reg…
For that reason, one of the most important pieces of music metadata is often invisible to listeners: the connection between the recording code and the composition code. That single relationship frequently determines whether revenue moves smoothly through the system or becomes another unmatched royalty waiting to be claimed. [blog.songtrust.com]blog.songtrust.comSong Registration Tips | What's the Difference: ISRC vs ISWC6 Apr 2020 — An ISWC can be linked to any number of ISRCs, while each ISRC is… [2arXiv]arxiv.orgarXiv Towards an Open and Scalable Music Metadata LayerarXiv Towards an Open and Scalable Music Metadata Layer
Amazon book picks
Further Reading
Books and field guides related to The two codes behind every paid song. Use these as the next step if you want deeper reading beyond the article.
All You Need to Know About the Music Business
Explains the rights structure that ISRC and ISWC codes support.
How to make it in the new music business
First published 2017. Subjects: Music trade, Popular music, Music, Vocational guidance, Economic aspects.
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Endnotes
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Source: ifpi.org
Link: https://www.ifpi.org/wp-content/uploads/2021/02/ISRC_Handbook.pdfSource snippet
IFPIInternational Standard Recording Code (ISRC) HandbookISRC identifies the recording not the encoding of the recording so the same reco...
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Source: iswc.org
Link: https://www.iswc.org/iswcSource snippet
ISWCThe ISWCThe ISWC identifies musical works, not their manifestations, objects, or expressions (e.g. publications, broadcasts...). The...
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Source: cisac.org
Link: https://www.cisac.org/services/information-services/international-identifiersSource snippet
CISACInternational IdentifiersThe ISWC identifies musical works by reference to the title of a work and its creators (including composers...
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Source: isrc.ifpi.org
Link: https://isrc.ifpi.org/why-use-isrc/when-not-to-assignSource snippet
ifpi-isrcWhen Not To AssignISRC is used to identify sound recordings and music videos only. ISRC should not be used to identify other ite...
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Source: iswc.org
Link: https://www.iswc.org/homeSource snippet
ISWC: HomeThe ISWC (International Standard Musical Work Code) is a unique, permanent and internationally recognized reference number for...
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Source: cisac.org
Title: new improved music identifier will help creators all important digital
Link: https://www.cisac.org/Newsroom/news-releases/new-improved-music-identifier-will-help-creators-all-important-digitalSource snippet
CISACNew improved music identifier will help creators in the all-...24 Sept 2020 — A two-year project to modernise the global ISWC syste...
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Source: ascap.com
Title: iswc number work codes faq
Link: https://www.ascap.com/help/registering-your-music/iswc-number-work-codes-faqSource snippet
All About ISWCs and How They Can Help You Get Paid18 Nov 2023 — The International Standard Musical Work Code (ISWC) is a unique, permanen...
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Source: blog.songtrust.com
Link: https://blog.songtrust.com/isrc-iswc-song-registration-tipsSource snippet
Song Registration Tips | What's the Difference: ISRC vs ISWC6 Apr 2020 — An ISWC can be linked to any number of ISRCs, while each ISRC is...
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Source: apraamcos.co.nz
Title: what is an iswc and how does it help get you paid
Link: https://www.apraamcos.co.nz/about-us/news-and-events/what-is-an-iswc-and-how-does-it-help-get-you-paidSource snippet
APRA AMCOSWhat is an ISWC and how does it help get you paid?26 Mar 2024 — The ISWC (International Standard Musical Work Code) is a unique...
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Source: muzisecur.fr
Title: isrc code complete guide
Link: https://www.muzisecur.fr/en/blog/isrc-code-complete-guide/Source snippet
ISRC Code: Complete Guide for Music17 Mar 2026 — The ISRC identifies the sound recording (the master), while the ISWC identifies the musi...
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Source: arxiv.org
Title: arXiv Towards an Open and Scalable Music Metadata Layer
Link: https://arxiv.org/abs/1911.08278 -
Source: iswc.org
Link: https://www.iswc.org/cmosSource snippet
ISWC for Collective Management OrganisationsThe ISWC is used to identify musical works (including versions etc.), regardless of whether t...
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Source: isrc.ifpi.org
Link: https://isrc.ifpi.org/faqsSource snippet
I use ISRC to identify it? No. ISRC is not for identifying audio-visual works. It is for identifying sound recordings and music video rec...
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Source: help.songtrust.com
Link: https://help.songtrust.com/knowledge/if-i-release-a-work-as-a-single-and-again-on-an-album-does-the-isrc-stay-the-sameSource snippet
the ISRC Change If I Release a Work as a Single and...A song that is released as a single and as part of an album will always maintain t...
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Source: iswcnet.cisac.org
Link: https://iswcnet.cisac.org/Source snippet
cisac.orgISWC: PortalThe ISWC (International Standard Musical Work Code) is a unique, permanent and internationally recognized reference...
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Source: aria.com.au
Link: https://www.aria.com.au/industry/isrcSource snippet
ISRCEach ISRC is a unique and permanent identifier for a specific recording which can be permanently encoded into a product as its digita...
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Source: Wikipedia
Title: International Standard Recording Code
Link: https://en.wikipedia.org/wiki/International_Standard_Recording_CodeSource snippet
International Standard Recording CodeAn ISRC identifies a particular recording, not the work (composition and lyrical content) itself...
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Source: qmul.ac.uk
Title: international standard musical work code
Link: https://www.qmul.ac.uk/ccls/alumni/news/2023-news/items/international-standard-musical-work-code.htmlSource snippet
11 Sept 2023 —... ISWC is the international standard identifier for musical works. Every time a song is written by a composer and is reg...
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Source: Wikipedia
Title: International Standard Musical Work Code
Link: https://en.wikipedia.org/wiki/International_Standard_Musical_Work_CodeSource snippet
International Standard Musical Work CodeThe International Standard Musical Work Code (ISWC) is a unique identifier for musical works...
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Source: musicbrainz.org
Link: https://musicbrainz.org/doc/ISRCSource snippet
ISRCThe International Standard Recording Code, abbreviated to ISRC, is a system of codes that identify audio and music video recordings.R...
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Source: apraamcos.com.au
Title: what is an iswc
Link: https://www.apraamcos.com.au/about-us/news-and-events/what-is-an-iswcSource snippet
and how does it help you get paid?15 Mar 2024 — The ISWC (International Standard Musical Work Code) is a unique, permanent and internatio...
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Source: facebook.com
Link: https://www.facebook.com/groups/massdogmusic/posts/1610031129894611/Source snippet
If you remaster a song, should you use another...Summary: The ISRC is a code that identifies recordings, while the ISWC is a code for mu...
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Source: nicklandis.com
Title: Like the ISRC is for recordings and the ISNI is for people.Read more
Link: https://www.nicklandis.com/blog/iswcSource snippet
ISWC - Nick Landis Mastering14 Aug 2018 — The International Standard Musical Work Code, or ISWC, is a unique identifier for musical works...
Additional References
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Source: ppimusic.ie
Link: https://www.ppimusic.ie/about-ppi/isrc-codes-faqSource snippet
ISRC Codes FAQNo, ISRC codes are just a means of identifying sound recordings and music videos. For barcodes please check with your CD ma...
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Source: soundcharts.com
Link: https://soundcharts.com/en/isrc-finderSource snippet
ISRC Finder – Official ISRC LookupISRC stands for International Standard Recording Code. It is a unique, 12-character identifier for a sp...
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Source: cott.org.tt
Link: https://cott.org.tt/wp-content/uploads/2022/03/ISRC-Handbook.pdf -
Source: linkedin.com
Link: https://www.linkedin.com/pulse/ultimate-guide-music-metadata-juan-camilo-sarassa-rds9e -
Source: get.bandcamp.help
Link: https://get.bandcamp.help/en/articles/15263219-what-are-the-publishing-rights-fields-forSource snippet
are the Publishing Rights fields for?26 May 2026 — For publishing royalties, entering an ISRC is a reliable way to track Bandcamp sales a...
Published: May 2026
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Source: iso.org
Link: https://www.iso.org/obp/ui/en/Source snippet
It is not used to identify manifestations of, or objects...Read more...
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Source: feiyr.com
Title: The ISRC enables the unique identification of recordings.Read more
Link: https://www.feiyr.com/en/blog/isrc-and-iswc-an-explanation-for-music-lovers/Source snippet
ISRC and ISWC: An explanation for music lovers26 Mar 2025 — The ISRC is a code that identifies recordings, while the ISWC is a code for m...
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Source: community.metabrainz.org
Title: should we correct misapplied isrcs
Link: https://community.metabrainz.org/t/should-we-correct-misapplied-isrcs/713553Source snippet
Style10 Sept 2024 — According to the ISRC Handbook: ISRC is a unique identifier for sound and music video recordings where one, and only...
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Source: support.cdbaby.com
Title: 360019038511 Understanding ISRCs
Link: https://support.cdbaby.com/hc/en-us/articles/360019038511-Understanding-ISRCsSource snippet
ISRCs7 Oct 2025 — An ISRC is a permanent code assigned to a specific recording. It applies to the sound recording itself, not the underly...
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Source: horusmusic.global
Title: breaking down metadata understanding upcs isrcs and iswcs
Link: https://www.horusmusic.global/breaking-down-metadata-understanding-upcs-isrcs-and-iswcs/Source snippet
This is the identifier that refers to the specific master copyright recording of a track.Read more...
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