ISWC · Musical Work
I ONCE THOUGHT I KNEW BUT NOW I'M NOT SO SURE
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The ISWC for “I ONCE THOUGHT I KNEW BUT NOW I'M NOT SO SURE” is T-000192457-7. 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).
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T-000192457-7 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “I ONCE THOUGHT I KNEW BUT NOW I'M NOT SO SURE”. 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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