Somehow missed this thread.....
Well you've made a great discovery! Lester's style gave birth to a complete alternative approach to Coleman Hawkins and inspired a raft of cool players including Al Cohn, Zoot Sims, Paul Quinichette, Paul Desmond, Gerry Mulligan , to name a few....
I agree with Rhys, much of Lester's later stuff, while suffering from alcoholism, doesn't match up to his 30s and 40s playing (with the Basie band and small groups). His records with Billie Holiday are brilliant. There are some gems though. Some of the tracks (eg All of Me) from his 50's album with Teddy Wilson (plus Jo Jones, Gene Ramey - how could you go wrong?!) stand out, though some others are hackneyed. The same can be said of the Jazz Giants album with the same rhythm section (plus Freddie Green) and with Roy Eldridge and Vic Dickenson. That TV film of his last meeting with Billie Holiday is poignant. It was re-recorded a few days later for album release only with slightly different personnel.
There are couple of biographies of Lester Young, by Lewis Porter and Prof Douglas Daniels. I have read the latter and although it gives useful facts and anecdotes it is too political for my taste. Daniels has said he didn't know anything of Young before he researched it and indeed didn't like his music. I suspect, although I haven't read it, that Porter's gives a more musical appreciation.
YC