Help me build up a jazz album collection. Can you suggest a must have album?

For Bill Evans, I like Waltz for Debbie even more than the Village Vanguard album which came from the same series of performances.  Also, his Portrait in Jazz.

I concur otherwise with many of the above suggestions.  But an omission is Herbie Hancock--get a greatest hits anthology or Maiden Voyage and (if you like electric funk-jazz) Chameleon.

Paul Desmond is my favorite alto-sax player.  His albums with guitarist Jim Hall are wonderful, although one of them had some string arrangements I could do without. Easy Living is one of their better albums.

I would also add Smokin' at the Half Note by the Wynton Kelly Trio with Wes Montgomery, as my favorite Wes album.  Give the guitarists some.