Hardly a mention here of Count Basie. While best known as leader of his big band, towards the end of his career he made a number of outstanding small combo albums on the Pablo Label. Look for any that say Basie Jam or Kansas City. Great music and super high quality recordings.
My favorite album unmentioned so far is Mulligan Meets Monk. I read somewhere that Gerry Mulligan was awed at the idea of playing with Monk. But he would only do it they could play together on Monk's masterpiece "Round Midnight." It is probably the most recorded song written by any jazz artist, and this version is as good as any.

