What ever happened to John Jenkins? The Chicago native made a handful of recordings in the late 50s, with hard boppers such as Hank Mobley and Jackie McLean, that showed he was one of the very best Charlie Parker discipies–in fact, possibly no other alto saxist better captured the purely lyrical essence of Parker. If anything Jenkins’s phrasing was even more broken than Parker’s, and his tough-minded sense of linear flow placed him a step ahead of most of his contemporaries, and far ahead of today’s generation of glitzy Parker distorters. Jenkins reappears Sunday along with Charles Davis, another first-generation bop disciple, who was one of the first to play bop on the baritone sax. Davis likes to invent long, many-noted lines, and he’s played in many bands since he got his start 40 years ago in Sun Ra’s Arkestra. Both Davis and Jenkins are former students of the beloved Captain Walter Dyett at DuSable High School; they’ll play at the Jazz Institute of Chicago’s semiannual tribute to Dyett, along with bassist Penny Pendleton, drummer Wilbur Campbell, and other Dyett students. Expect to hear some revelations. Sunday, 3-7 PM, Joe Segal’s Jazz Showcase, Blackstone Hotel, 636 S. Michigan; 427-1676 or 427-4846.