The thing I remember about Jack Sheldon is that he played in talk show host Merv Griffin's Orchestra. At the time(early 1970's) he appeared to me at least, a real corn ball and horribly unhip even with his shoulder length hair. Come to find over 30+ years later when I began listening to west coast jazz from the 1950's, I found he played on a number of dates. A competent player. Certainly not top tier, but someone who definitely could hold his own. Sorry to hear of his passing. I'll dig out some of those sessions in the coming days in his memory. The Sheldon disc sited by many here is definitely on the list.