ISWC · Musical Work

T-304429627-3

WRITING A LETTER

Last verified: July 27, 2026

The ISWC for “WRITING A LETTER” is T-304429627-3. 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

304429627Work 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.

SourcesCISACMusicBrainzMLC3 sources

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What is ISWC T-304429627-3?

T-304429627-3 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “WRITING A LETTER”. 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-304429627-3

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What is ISWC T-304429627-3?

T-304429627-3

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What is ISWC T-304429627-3?