slime.oofytv.set:

not a bad read, it's a chronological excursion of how jazz played a big part of fz's music starting before freak out! and ending with the '88 band

all the musicians he played with that had any connection to jazz are noted, along with selected conversations or correspondence the author had with some of them, their jazz credentials before & after their zappa gigs in the studio or on stage and their opinion of zappa ... the author attempts to relate many zappa compositions or even a few bars in a zappa song to jazz tunes both obscure, familiar, straight ahead, fusion, avant garde

he concludes zappa had a fundamental admiration for jazz despite his negativity on the subject 

Bookshops

Book Depository (worldwide free shipping)
Amazon.com

Reviews

All About Jazz (contains excerpt from chapter 2)
Bill Milkowski, Down Beat
Review by Alun Hamnett @ Record Collector
United Mutations
Idiotbastard
zappa.com