ISRC vs ISWC: What's the Difference?
Both are music identifiers, but they identify completely different things. Here's how to tell them apart.
Quick answer: An ISRC identifies a specific recording (the audio file), while an ISWC identifies the composition (the song itself — melody, lyrics, and arrangement). One composition (ISWC) can have many recordings (ISRCs).
Side-by-side comparison
| ISRC | ISWC | |
|---|---|---|
| Identifies | A specific sound recording | A musical composition (the song) |
| Format | USRC12400001 (12 chars) | T-012345678-9 (13 chars) |
| Standard | ISO 3901 | ISO 15707 |
| Assigned by | Labels, distributors, RIAA | PROs via CISAC |
| Managed by | IFPI (International ISRC Agency) | CISAC |
| Used for | Tracking streams, sales, chart reporting | Tracking mechanical & performance royalties |
| Who needs it | Anyone releasing a recording | Songwriters & publishers |
When to use each
Use ISRC when…
- Distributing a recording to streaming platforms
- Reporting chart data or sales
- Identifying which specific audio file was played
- Tracking streams across platforms
Use ISWC when…
- Registering a song with your PRO
- Collecting mechanical royalties from the MLC
- Licensing a song for film, TV, or ads
- Tracking a composition across all its recordings
How they relate
The relationship is one ISWC to many ISRCs. A single composition can have dozens of recordings — the original studio version, live performances, remixes, covers, and remasters. Each recording gets its own ISRC, but they all share the same ISWC.
Composition (ISWC)
"Yesterday" — T-010.086.197-3
Recording — The Beatles, 1965 original (ISRC)
Recording — Frank Sinatra, 1969 cover (ISRC)
Recording — Boyz II Men, 2009 cover (ISRC)
Recording — The Beatles, 2015 remaster (ISRC)
Each of these recordings has its own ISRC, but royalties for the composition flow back to the same ISWC — and therefore to the same songwriters.
Frequently asked questions
Is an ISRC the same as an ISWC?
No. An ISRC (International Standard Recording Code) identifies a specific sound recording — the audio file. An ISWC (International Standard Musical Work Code) identifies the underlying musical composition — the song itself. They serve different purposes in the music rights ecosystem.
Does every ISRC have an ISWC?
Not necessarily. Every recording should ideally be linked to a composition, but many ISRCs have no ISWC match yet. This is called an "unmatched" recording and is one of the biggest problems in music rights — it means the songwriter may not be getting paid for that recording.
Can one song have multiple ISRCs and ISWCs?
One song typically has one ISWC (the composition) but can have many ISRCs — one for each recording (original, remix, live version, cover, remaster). In rare cases, duplicate ISWCs exist when the same work was registered separately in different territories.
Which do I need as an independent artist — ISRC or ISWC?
You need an ISRC for every recording you distribute — your distributor (DistroKid, TuneCore, etc.) typically assigns one automatically. An ISWC is assigned when you register your composition with a PRO (ASCAP, BMI, etc.). If you're both the songwriter and performer, you need both.
How do ISRCs and ISWCs connect for royalty payments?
The MLC (Mechanical Licensing Collective) and PROs use the link between ISRCs and ISWCs to route royalties correctly. When Spotify pays mechanical royalties, the MLC matches the recording (ISRC) to the composition (ISWC) to find the songwriters (IPIs) who should be paid.
Try it yourself
Look up real ISRC and ISWC codes in our free database:
Key terms
- Recording
- A specific audio file — one performance of a song captured in a studio or live. Each recording gets its own ISRC.
- Composition
- The underlying musical work — the melody, lyrics, and arrangement. A composition gets one ISWC and can have many recordings.
- Unmatched recording
- A recording (ISRC) that has not been linked to its composition (ISWC). Unmatched recordings mean songwriters may not be receiving mechanical royalties.
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