Funny "alto story." I have the video, Classic jazz Drummers. There is a video clip of Kenny Clarke with JJ Johnson. With Johnson is Sonny stitt, and some trumpeter that I am not aware of. Looks like everyone in the band didn't pre=plan the arrangements at all, and when someone wanted to take a solo, they just said, "My turn." About 2 seconds into Sonny Stitt's solo, this trumpet player goes up to Sonny, am I'm guessing says, "Can I solo." (The music is too loud to hear,) But then I think Stitt says, no I'm playing, with a sort of nasty look on his face. After his, probaly 32 bar solo, the trumpeter takes the solo to trade off with Kenny, Sonny gives him a dirty look.