Sick

. Sounds like something I should be doing (just dug into rhythm changes in a serious manner today.)
I've been waiting for any opportunity to plug this book -- "the Jazz Bassline Book" by Mike Downes. I bought this a couple weeks ago and started working through it recently. REALLY cool stuff -- he digs into everything a bass player will ever play except soloing. Amazing, amazing stuff.
He has sections on blues and rhythm and for each he has a 1 chorus transcribed each of recordings by 8 different bass players. For the blues, this includes Pops Foster, PC, Miroslav Vitous, and Charlie Haden. Let me tell you this right now -- that one chorus of Miroslav's blues playing is just about the damn hardest blues I've ever played. He goes outside the changes and covers a huge range all over the fingerboard. Incredibly difficult -- you have no idea how incredibly relieved I was when it came time to play Haden's chorus!
I've heard him play live and he completely blew everyone away...he's also the head of the bass dept. at Humber College's music program, too. Great player, great guy,
GREAT book. Probably one of the coolest things I've seen in it yet is the whole whack of iim7-V7-I licks by Chuck Israels. That, or the ii-V-I pattern in all 12 keys (circle of fourths) major, and then a different pattern for a minor iim7-V7b9-i (once again, circle of fourths all twelve keys.) If you get nothing else out of it, it will do wonders for your reading.
EDIT: Also, one of the biggest things Mark Levine preaches (and by extensions, in jazz programs ALL over) is to play everything in 12 keys. Looks like you've got it down

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Best advice to put this into application -- and just about the whole time you'll ever hear Body and Soul called in B major or Autumn Leaves in Eb minor -- is to work with a singer.