In regard to "avant-garde" and free jazz, can you say NOISE. Meanwhile, back at the ranch; I came across some unusual gems. The first one is "Arab Jazz Jam", the second one is "Basem Darwish Egyptian Jazz spirits"; these are some intense musicians who illustrate the best of "World Jazz".
http://www.youtube.com/watch?v=rZebxd-G3o8&feature=related
http://www.youtube.com/watch?v=AAX43gYkY-w
http://www.youtube.com/watch?v=rZebxd-G3o8&feature=related
http://www.youtube.com/watch?v=AAX43gYkY-w