ISWC · Musical Work

T-303715475-5

THAT'S WHEN I KNEW

Last verified: October 27, 2026

The ISWC for “THAT'S WHEN I KNEW” is T-303715475-5. 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

303715475Work number

5Check 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-303715475-5?

T-303715475-5 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “THAT'S WHEN 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-303715475-5

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What is ISWC T-303715475-5?

T-303715475-5

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What is ISWC T-303715475-5?