The kiddie corps that currently rules the jazz roost seeks to prove the strength of bebop by reprising it, by reiterating its lessons. But you hear much greater proof of the idiom's resiliency listening to Roy Haynes. Haynes was around for bebop's infancy, but he's traveled a wide variety of other musical paths: how many other drummers could have played with Thelonious Monk in the 50s, John Coltrane in the 60s, and Gary Burton after that? In each context, his bebop roots are as clear as day in his crisply articulated accompaniment phrases or in the prismatic rhythmic carpet he unrolls for the band; yet the way he adapts those virtues to each context tells us much about the real strength of bebop, and even more about Haynes. His band is made up of players about half his age--including the steadily developing saxophonist Craig Handy--and music shaped by Haynes's fiery, hypersensitive, sometimes whimsical, and wholly unmistakable style. It's the second straight year that Haynes's quartet inaugurates Joe Segal's annual Charlie Parker Month celebration, and that's entirely appropriate: Haynes, who played with Parker from 1949 to 1952, was reportedly Bird's favorite drummer. Tonight through Sunday, Joe Segal's Jazz Showcase, Blackstone Hotel, 636 S. Michigan; 427-4300.