What an ISWC is, and why it decides whether you get paid
The ISWC identifies a composition rather than a recording. Without one, a use can be collected but never matched to your work.
Most people in music know the ISRC — the code that identifies a recording. Far fewer know the ISWC, and it is the one that decides whether songwriting money reaches the person who wrote the song.
A composition is not a recording
The ISWC — International Standard Musical Work Code — identifies the underlying work: the melody and the lyrics, the thing an author and a publisher own. One work can exist in a hundred recordings. A studio version, a live take, a cover by someone else, a sped-up edit on a video platform: one ISWC, many ISRCs.
That distinction is not academic. Royalties for the recording and royalties for the composition travel down completely separate pipes, collected by different parties under different agreements. If your work has no ISWC, the composition side of that money has nothing to attach itself to.
Where the money actually goes missing
Usage reports arrive constantly — from digital platforms, from broadcasters, from venues. Each line has to be matched to a specific work before anyone can be paid. When a line cannot be matched, it does not vanish; it goes into an unidentified account and sits there.
The industry calls that pool the black box, and it is large: an estimated $2.5 bn unallocated worldwide, and around $1 bn held at The MLC in the United States alone. Much of it is eventually distributed by market share, which means money generated by independent writers ends up with whoever is biggest.
The cause is almost never fraud. It is metadata: a title spelled three different ways, a writer credited by a stage name in one report and a legal name in another, no code anywhere to tie them together.
What good identification looks like
An ISWC on its own is not enough. Matching works when a few things line up:
- The ISWC, identifying the composition.
- An IPI number for every writer and publisher — the identifier for the rights holder, not the work.
- Ownership shares that add up, declared once and consistently.
- Consistent titles and credits, including alternate titles a platform might report instead of the official one.
Get those right at registration and matching mostly takes care of itself. Get them wrong and every future report has to be repaired by hand, if anyone notices at all.
Getting codes for your catalogue
ISWCs are assigned through the rights management infrastructure, not requested one by one from a website. When you register a catalogue with us — by CWR file or with our CSV template — works that need an ISWC or an IPI get them, and we generate new codes weekly rather than in an annual batch.
If you are not sure what your catalogue currently has, that is a normal starting point. Send it over and we will tell you what is identified and what is not.