Sunburned Hand of the Man's Headdress -- like the nearly impossible-to-find CD-R series that makes up the bulk of the band's output -- is a series of jam sessions. Throughout each excursion members of the ensemble moan and whoop and shred their guitars. Others patter away on organs or drums or blow into horns and flutes. Sometimes the whole thing falls together and starts heading down the highway like Hawkwind; other times it sounds like a beachfront drum circle dumbing down a cover of something off Miles Davis's Live Evil. Along with recent releases from the No-Neck Blues Band, Black Dice, and the Boredoms, Sunburned's Headdress offers a return to the sloppy, primal elements of psychedelic improvisation that Phish, the String Cheese Incident, and other clownish inheritors of the Dead's legacy have glossed over.