Unified by the inclusion of improvised sections, Jam Bands cover a wide array of eclectic styles including Classic Rock, Groove Rock, Funk, Bluegrass, Electronica, Prog-Rock, Ambient, Psychedelia, and Jazz. The often-considered forefathers - The Grateful Dead - spawned (at least conceptually) bands like Phish, moe., String Cheese Incident, and Umphrey's McGee among others. -platzap