Jazz must have pressings???

Go to Amazon and buy a used copy of: "All Music Guide to Jazz" The most current edition, the 6th STARTS at $25 used and up. (PS I own two copies, not for sale!)
The next best is All Music Guide to Jazz third edition (1999) which starts at $2 used.
The 1999 edition is just as good (even better if you only want Jazz pre- year 2000.
An excellent guide. and has great ratings and small reviews for most recording sessions.
I have used it to purchase 99% of my JAzz LPs and CDs.
(1,800 JAzz LPs, and 700 Jazz CDs.)
I actually mark the book with what I own so I can keep it straight and not purchase dups. I always keep one in the car, along with the "All Music Guide to Rock".

If I had to have only one desert island Jazz record.. It would have to be Miles Davis Bitches Brew.
I wish I had bothered to hear it when it came out. But at that time i did not understand Jazz in any way, and did not listen to it at all.. (except perhaps once Dave Brubeck's Time Out.) ((I was really, really stupid back then))