ISWC · Musical Work

T-010355443-3

DIDN'T YOU USED TO BE SOMEONE I KNEW

Last verified: October 17, 2026

The ISWC for “DIDN'T YOU USED TO BE SOMEONE I KNEW” is T-010355443-3. ISWCs are ISO 15707 identifiers managed by CISAC; they identify the underlying song — its melody, lyrics, and arrangement — rather than any single recording. One composition can have many recordings (ISRCs).

Format

TPrefix

010355443Work number

3Check digit

Prefix:: "T" = musical work; "W" = work in progress.
Work number:: 9-digit unique work number assigned by CISAC.
Check digit:: ISO 7064 Mod 11-2 check digit that validates the rest of the code.

SourcesCISACMLCMusicBrainz3 sources

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What is ISWC T-010355443-3?

T-010355443-3 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “DIDN'T YOU USED TO BE SOMEONE I KNEW”. ISWCs are defined by ISO 15707 and managed by CISAC. Unlike ISRCs which identify recordings, an ISWC identifies the underlying song — the melody, lyrics, and arrangement.

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T-010355443-3

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What is ISWC T-010355443-3?

T-010355443-3

Format

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People also ask

What is ISWC T-010355443-3?