WHAT'S THE REASON - Free Jazz Leadsheet

“what’s the reason” is a less well-documented jazz tune, and reliable information on its composer, first recording, or publication date is not widely available in standard sources.

Due to this lack of clarity, there is no clearly defined “first” recording or canonical version that stands out in jazz history.

Thematically and musically, it likely follows typical song‑form structure, but until more archival research is done, its full history and significance remain ambiguous.