IPI, ISRC & ISWC: The Music Industry Identifiers You Need to Know

The music industry runs on three identification systems that most songwriters never think about — until royalties go missing. IPI numbers identify people, ISRC codes identify recordings, and ISWC codes identify compositions. Together, they form the infrastructure that routes money from streams, sales, and broadcasts back to the right creators.

IPI: the number that identifies you

An IPI (Interested Parties Information) number is a unique identifier assigned to songwriters, composers, and music publishers. Think of it as your social security number for the music industry — it tells collection societies worldwide exactly who you are, regardless of how many names or aliases you use.

You get an IPI number automatically when you join a performing rights organization (PRO) like ASCAP, BMI, or SESAC in the US, or PRS, GEMA, SACEM, and others internationally. You don't apply for it separately — it's assigned as part of your PRO membership. The number is typically 9 to 11 digits and stays with you for your entire career, even if you switch PROs.

Your IPI number appears on your work registrations, on cue sheets for film and TV placements, and in the global CISAC database that collection societies use to route royalties internationally. When a society in Japan collects performance royalties for your song played on Tokyo radio, your IPI number is how they identify you and send the money to your PRO.

ISRC: the code that identifies a recording

An ISRC (International Standard Recording Code) is a unique 12-character identifier for a specific sound recording. Not the song — the recording. If three different artists each record their own version of the same song, each recording gets its own ISRC. A remix of a track gets its own ISRC. A remastered version gets its own ISRC. The original stays the same.

The format follows a standard pattern: a 2-letter country code, a 3-character registrant code (identifying the label or issuer), a 2-digit year, and a 5-digit designation code. For example, USRC11700001 breaks down as US (country), RC1 (registrant), 17 (year), 00001 (first recording by that registrant in 2017).

Where to get an ISRC

If you distribute through a digital distributor like DistroKid, TuneCore, or CD Baby, they typically assign ISRCs for you automatically when you upload your music. If you're a label or want to manage your own codes, you can register as an ISRC Manager with your national ISRC agency (in the US, that's the RIAA's ISRC system) and self-assign codes.

One critical rule: never assign more than one ISRC to the same recording, and never reuse an ISRC for a different recording. The whole system breaks down if codes aren't unique. If your distributor already assigned an ISRC to your track, use that one everywhere — don't generate a new one.

ISWC: the code that identifies a composition

An ISWC (International Standard Musical Work Code) identifies the underlying musical composition — the song itself, independent of any particular recording. Where an ISRC tracks a recording, an ISWC tracks the creative work. The same ISWC applies whether the song is recorded as a punk version, an acoustic cover, or a full orchestral arrangement.

ISWC codes follow the format T-000.000.000-C, where T is a prefix indicating it's a musical work, the nine digits uniquely identify the composition, and C is a check digit. For example, T-034.524.680-1.

Unlike ISRCs, you don't assign ISWCs yourself. They're assigned by collection societies (your PRO or publisher) when you register the composition. When you register a new song with ASCAP, BMI, or your publisher, the work gets entered into the global database and eventually receives an ISWC through the CISAC network. The process isn't instant — it can take weeks or months for an ISWC to be assigned after registration.

How the three identifiers connect

Picture the relationship like this: a songwriter (identified by their IPI number) writes a song (identified by its ISWC), which is then recorded (identified by its ISRC). One songwriter can write many compositions. One composition can have many recordings. The identifiers link them all together in a chain that collection societies and digital services use to calculate and route payments.

When Spotify plays a track, the ISRC identifies the recording and determines who gets the recording royalties (typically the label or distributor). The platform also looks up the underlying composition via ISWC to determine who gets the mechanical and performance royalties. The songwriter's IPI ties everything back to the right person.

When any link in this chain is missing or wrong — a recording with no ISRC, a composition with an unregistered ISWC, a songwriter with no IPI — royalties fall into the gap. They don't disappear; they accumulate in unmatched pools and eventually get distributed to other rights holders based on market share. Your money becomes someone else's windfall.

Why these identifiers matter for royalty tracking

The practical implication is simple: if you want to get paid accurately and completely, your metadata has to be right. That means:

Join a PRO to get your IPI number. This is step one for any songwriter. Without it, no collection society in the world can identify you in their systems.
Ensure your recordings have ISRCs and that they're consistent across all platforms. Don't let different distributors assign different ISRCs to the same recording.
Register your compositions with your PRO and publisher so they can receive ISWCs. Include all co-writers and their correct ownership splits.
Keep your split sheets accurate and signed before registration. The ownership percentages on your split sheet become the data that societies use to divide royalties. If the splits are wrong or disputed, payments get delayed or misdirected.

The split sheet connection

When you register a composition, the society asks who wrote it and what percentage each writer owns. That information comes from your split sheet. Each writer's IPI number goes on the registration alongside their ownership share. If you have a signed split sheet with IPI numbers included, registration is a five-minute process. If you don't, it turns into a game of phone tag that delays your royalties and frustrates everyone involved.

The best time to sort out identifiers and ownership is the same day the song is written. Get the splits agreed. Get everyone's IPI numbers on the sheet. Sign it. Then register the work while the details are still fresh. That's the difference between royalties that arrive on time and royalties that vanish into unmatched pools.