ISWC · Musical Work

T-201051623-8

I DON T KNOW WHY

Last verified: September 16, 2026

The ISWC for “I DON T KNOW WHY” is T-201051623-8. 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

201051623Work number

8Check 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.

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What is ISWC T-201051623-8?

T-201051623-8 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “I DON T KNOW WHY”. 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-201051623-8

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What is ISWC T-201051623-8?

T-201051623-8

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What is ISWC T-201051623-8?