Mezz Mezzrow occupies an odd and unique place in jazz history. Although an enthusiastic clarinetist, he was never much of a player, sounding best on the blues. A passionate propagandist for Chicago and New Orleans jazz and the rights of blacks (he meant well, but tended to overstate his case), Mezzrow was actually most significant for writing his colorful and somewhat fanciful memoirs, Really the Blues, and for being a reliable supplier of marijuana in the 1930s and '40s. In the 1920s, he was part of the Chicago jazz scene, at first helping the young white players and then ann...