ISWC · Musical Work
WHAT I DID LAST NIGHT
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The ISWC for “WHAT I DID LAST NIGHT” is T-309740473-0. 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-309740473-0 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “WHAT I DID LAST NIGHT”. 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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