ISWC · Musical Work

T-309273156-7

WHAT MUST I DO?

Last verified: February 15, 2026

The ISWC for “WHAT MUST I DO?” is T-309273156-7. 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

309273156Work number

7Check 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.

SourcesCISACMLC2 sources

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What is ISWC T-309273156-7?

T-309273156-7 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “WHAT MUST I DO?”. 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-309273156-7

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What is ISWC T-309273156-7?

T-309273156-7

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People also ask

What is ISWC T-309273156-7?