Music contains several identifiers that look similar but perform completely different jobs.

Three of the most important are:

• IPI
• ISWC
• ISRC

Understanding them helps artists, labels and songwriters manage their catalogues correctly.

The simplest distinction is:

IPI identifies a songwriter or publisher.

ISWC identifies a musical work.

ISRC identifies a sound recording.

What is an IPI?

IPI stands for Interested Parties Information.

It identifies songwriters and publishers within international rights-management systems.

A songwriter may receive an IPI through their performing-rights organisation.

The identifier helps distinguish writers who have similar names.

That becomes particularly useful when compositions involve several international collaborators.

What is an ISWC?

ISWC stands for International Standard Musical Work Code.

It identifies the underlying composition.

Think about a song written by two people.

Those writers create one musical work.

The work may later be recorded by different artists.

The ISWC relates to the composition rather than one particular recording.

What is an ISRC?

ISRC stands for International Standard Recording Code.

It identifies a particular sound recording.

Imagine a songwriter writes a track called “Running Home”.

Three versions are recorded:

• Original studio recording
• Acoustic recording
• Live recording

Each is a different recording and will normally have its own ISRC.

They may all relate to the same underlying composition.

Can one ISWC connect to several ISRCs?

Yes.

That is one of the most useful ways to understand the system.

One composition can be recorded many times.

An original, a live version and a separately recorded cover may all use different recording identifiers while referring to the same underlying work.

Is an IPI the same as a PRO membership number?

Not necessarily.

Your performing-rights organisation may provide a membership or account number as well as an IPI.

They are not automatically interchangeable.

Check the specific identifier requested by your publishing administrator.

When do you need each?

Registering a songwriter

You may need the songwriter’s IPI.

Registering the composition

The work may be linked to an ISWC.

Distributing a recording

You need an ISRC for the relevant sound recording.

Managing the complete catalogue

Keeping all three creates a clearer connection between people, works and recordings.

Do these identifiers prove ownership?

No identifier alone proves copyright ownership.

A code helps identify a person, work or recording.

Ownership still depends on the relevant legal rights and agreements.

Create a catalogue database

For every commercially important recording, maintain:

• Artist
• Track title
• ISRC
• Composition title
• ISWC
• Writer names
• Writer IPIs
• Publishing shares
• Publisher details
• Distributor

Final thoughts

Music identifiers are not interchangeable.

IPI = songwriter or publisher.

ISWC = composition.

ISRC = recording.

Once you understand that structure, publishing registrations and catalogue management become much easier.