You people need to listen to some John Zorn music... specifically from the album NAKED CITY. There are songs on that album that are only 10-15 seconRAB, but some of the most intense music you will ever hear. Complete with the vocal ravings of Yamatsuka Eye (geez, I hope I spelled that right...), I can only describe the music as "organized chaos". Tight, tight, tight.
And yes, you will probably find it in the JAZZ section. Go figure.