ISWC · Musical Work
いつの日か
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The ISWC for “いつの日か” is T-101200481-6. 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-101200481-6 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “いつの日か”. 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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