Hi guys, I've been listening to a lot of jazz on online radio stations nowadays and seem to have developed a liking for the stuff

. I was wondering if there was some book out there which puts the whole Jazz music phenomenon and the people involved into perspective and maybe gives some info about various sub-genres and their evolution. I'm not looking for a technical book with notations which would tell you how to play, a more layman's musical history perhaps. Jazz seems to be the kind of music you'd appreciate better by knowing a bit more about it.