ISWC · Musical Work
WHY DIDN'T I KNOW
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The ISWC for “WHY DIDN'T I KNOW” is T-072828550-4. 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).
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T-072828550-4 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “WHY DIDN'T I KNOW”. 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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