WW, I'll second Chet Baker, Stan Getz and Bill Evans. As for Miles Davis,his albums SOMEDAY MY PRINCE WILL COME and MILESTONES which preceded "'Blue" are also very fine. Also very cool was Lester Young. You might want to check his pre-war recordings with Count Basie, Billie Holiday and especially the Kansas City Six. Going back a bit further coolness was evident in the recordings of Bix Beiderbecke. Especially those with Frankie Trumbauer like "I'm Coming Virginia" and "Singing the Blues". Happy listening. What is "cool" anyway?

PS One of the great things about this site is that you people are always reminding me of great music that I sometimes forget about. Listening to THE GENTLE SIDE OF JOHN COTRANE right now. It is a compilation from BALLADS, the album with Johnny Hartman and I believe the one with Duke Ellington (oh yeah, Johnny Hodges).Johnny Hartman singing "Lush Life", McCoy Tyner intros arrrggghhh...