ISWC · Musical Work

T-305306899-4

IMPROMTU NO.1 (APOGEE)

2 recordings

Last verified: August 17, 2026

The ISWC for “IMPROMTU NO.1 (APOGEE)” is T-305306899-4. 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). This work has 2 known recordings (ISRCs) indexed on Credits.fm.

Format

TPrefix

305306899Work number

4Check 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.

Credit Chain

ISRC2 recordings

ISWCIMPROMTU NO.1 (APOGEE)

SourcesCISACMLCMusicBrainz3 sources

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CISAC ISWC registry search

Identifier Graph

What is ISWC T-305306899-4?

T-305306899-4 is an International Standard Musical Work Code (ISWC) that uniquely identifies the musical composition “IMPROMTU NO.1 (APOGEE)”. 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.

This work has 2 recordings (ISRCs) associated with it. Each recording represents a distinct version — such as the original, a remix, a live performance, or a cover — that shares the same underlying composition.

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T-305306899-4

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T-305306899-4

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What is ISWC T-305306899-4?

Recordings (2)