Jazz lovers, rejoice. Robert Altman's hypnotic riff on his hell-raising, whoremongering, crime-ridden Missouri hometown during the Depression is brimming over with vibrant, vital music. Like the young Charlie Parker played by Albert J. Burnes in the movie, Altman used to sneak into the jazz clubs on 18th and Vine to hear the sounds of Duke Ellington, Count Basie and Bennie Moten. The director gathered 21 jazz greats -- veterans and newcomers -- to catch the period spirit. He re-enacts a jam