Say, I haven't seen Cowboy Bebop on Cartoon Network in a while.
As for music, Bebop is not "free-form" Jazz. Even though Bebop was a reaction against the highly-structured "Big Band" and "Swing" styles of Jazz, Bebop (or Bop) usually follows the pattern of: stating an introductory melody and establishing rhythmic feel, soloing in turn by the lead (and occasionally rhythm) instruments (usually horns), and restating the melody before conclusion of the piece.
Scat singers use vocal sounds (such as "scibbety-bop, de-bop, de-doo-wah") to imitate, rival, and even accompany instrumental solos. Plus, the singers get to show off their chops.
Acapella singers use "doo-wop" and similar sounds in place of an instrumental rhythm section.
Also, some Bebop grew into Hard Bop which in turn helped serve as a basis for some of the "Modern" Jazz sound of the 60s (as opposed to the "Cool" sound that birthed the "Modal" movement also of the 60s). The Modern style still influences many of today's Jazz artists and groups. So, Bebop lives.
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