The Bluffer's Guide to Jazz - Kindle - free.
Part of the "Bluffer's Guides" series, this book explains how to bluff your way in jazz. These guides are designed to help the reader achieve instant expertise and become a successful bluffer. Other "Bluffer's Guides" look at accountancy, golf, music and world affairs.
Also, today all the Bluffer's guides books are 99p, some are well worth it:http://www.amazon.co.uk/l/4725112031/