Music metadata: why royalties go missing

Every royalty payment is the output of a matching exercise: a usage report from a service or broadcaster is matched against an ownership database, and money follows the match. When the data on either side is wrong, missing or contradictory, the match fails. The money doesn't vanish; it parks in suspense accounts, distributes to the wrong claimant, or eventually spreads across the market as black-box income.

Estimates of how much goes astray vary widely, but every serious study puts it in the hundreds of millions annually. For an adviser, metadata hygiene is unglamorous work with a directly measurable payoff.

The identifiers that carry the money

Two code systems do most of the load-bearing. Each recording carries an ISRC, assigned at distribution, which travels with the audio through every service and usage report. Each song carries an ISWC, assigned through society registration, which identifies the composition regardless of which recording was played.

The chronic problem is that nothing reliably links the two. A service reports plays by recording (ISRC); the societies pay by song (ISWC); and the mapping between them is reconstructed by fuzzy matching across databases that were never designed to agree. Cover versions, remixes and re-releases multiply the ISRCs pointing at one ISWC, and every weak link is a place money leaks.

Where the matching breaks

The failure patterns repeat across clients and are worth recognising on sight.

Conflicting registrations: two societies or publishers claim overlapping shares of one song, so payments freeze or split wrongly until the conflict resolves.
Split mismatches: the writers filed different percentages at different societies. Distributions disagree and the discrepancy compounds every period.
Name and spelling drift: a writer credited three ways across releases fragments into three part-matched identities.
Missing ISWCs: a song never registered at a society earns performance and mechanical income that has nowhere to land.
Re-released recordings under new ISRCs that nobody connected to the original, splitting the play history.

The suspense pile and the black box

Unmatched money sits in suspense for a claims window. What is never claimed eventually distributes, typically by market share, to the very largest rights-holders: the black box. The practical meaning is blunt: badly registered independent writers subsidise the majors.

Claims windows put a clock on the problem. Money unmatched beyond the window is not late, it is gone. That is why metadata reviews belong on an annual cycle rather than a some-day list, and why taking on a new client should always include a sweep of their historical registrations, not just their new releases.

The hygiene routine that pays for itself

The fix is procedural, not clever. One canonical spelling of every name. A split sheet agreed in the session and filed identically everywhere. ISRCs assigned once and reused for the same recording, never re-minted for a re-upload. Registrations checked at each society the client earns from, and conflicts chased rather than left to time out.

For a client with any catalogue depth, a one-off audit of registrations against earnings sources usually surfaces recoverable money, and the lessons below walk through how the matching machinery works underneath.

Figures referred to

Scale of unmatched royaltiesIllustrative: Industry estimates of unmatched or misallocated royalties run to hundreds of millions of pounds a year globallyPublished industry studies and trade-press reporting · as of 2024

Figures marked Illustrative show the shape of the market, not a quoted rate. The lessons keep the maintained, sourced numbers.

Common questions

What is music metadata?

The data that identifies who made and who owns each song and recording: titles, writer and performer names, ownership splits, and the code systems that carry them (ISRC for recordings, ISWC for songs). Royalty systems pay by matching usage reports against this data, so errors in it translate directly into missing income.

What is black-box income?

Royalties that could not be matched to a rights-holder within the claims window. After the window closes they are typically distributed by market share, which routes them to the largest companies. Preventing your share of the black box means registering accurately and claiming within the window.

What is the difference between an ISRC and an ISWC?

An ISRC identifies one specific recording and is assigned at distribution; an ISWC identifies the underlying song and is assigned through society registration. A song has one ISWC but can have many ISRCs (covers, remixes, re-releases), and mismatches between the two systems are a leading cause of unpaid royalties.

Learn this properly

The interactive lessons on this topic, with sourced figures and live simulators: