" During the so-called Jazz Age, most of the music's key exponents focused their creative energy on soloing not bandleading, on improvisation not orchestration, on an interplay between individual instruments not between sections.
[...] Commercial pressures, rather than artistic prerogatives, stand out as the spur that forced many early jazz players (including Armstrong, Beiderbecke, and Hines) to embrace the big band idiom. But even in the new setting, they remained improvisers, first and foremost, not orchestrators or composers. "

― , The History of Jazz