There is more than one Sleestak on last.fm. DOOM. PSYCHEDELIA. STONER ROCK. The three terms which solidify and justify the existence of this musical anomaly known as SLEESTAK. Formed in late 2003 with former members of Sixinch, Atomic Number 9, and Planet Delirium, Sleestak have become one of the midwest's most unique bands, gaining fans in the region and abroad with their metal/psychedelic fused doom rock. Sometimes labeled a "metal jam band", the band often delve into the bluesy realms of improvisation and embrace free-flowing instrumentals, taking the music into epic mind-altering depths.