In 2001 , Oysterhead officially reformed to record and release an album entitled '' The Grand Pecking Order '' , which featured nine new tracks in addition to four songs originally debuted in New Orleans . The release of this album was supported by a brief tour of North America , during which most shows were performed to sold-out audiences . The Oysterhead tour of fall 2001 also saw the debut of the Matterhorn , a guitar played by Trey Anastasio featuring a full-size deer antler that Trey manipulated to make sounds similar to those of a theremin . On November 5 , 2001 , the band performed the song " Oz Is Ever Floating " on '' Late Night with Conan O'Brien '' . After the 2001 tour , which had schedule changes due to the September 11 attacks , the trio went their separate ways
September 11 attacks
September 11 attacks
Oysterhead