I'm just finishing the book A Power Stronger Than Itself - The AACM and American Experimental Music, a fascinating history of the Association for the Advancement of Creative Musicians, the Chicago-born collective that has produced and inspired a huge chunk of the best modern Jazz and Jazz-derived music of the last thirty years. One compaint about this music is how supposedly inaccessible it is. Yeah right.
In contrast to that idea here's a clip of the AACM's most legendary product, the Art Ensemble of Chicago, giving up the funk at an unidentified live bass with Malachi Favors playing electric (!) bass, Roscoe Mitchell getting down on baritone sax and Lester Bowie energetically pounding a bass drum! Their music can be complex but it's not that much work to get into it.