Most jazz books state that the 2 minor 5 seventh and the root or the 1 chords are the foundation for playing jazz.

There are just so many chords and the more tunes you learn the chord structure to, you will find that they are all related in one way or another for the most part and it gets easier to figure the chords out by ear.

Of coures like everything else there are exceptions to the rule. For me it is still "All The Things You are" "Darn That Dream" and a few more that I find difficlut to follow and remember the chord structure to.

The chord structure is the most fasinating part of music to me. Like Dave said "Lush Life" is different also, but it doesn't turn me on enough to learn it.