Blue OYSTER Cult is an American rock band formed in 1967. They are best known for their hit single '(Don't Fear) The Reaper' and have released several albums over the years. BLUE OYSTER Cult has been credited with helping to pioneer the heavy metal genre, and their music has been featured in films and television shows. The band's name is derived from a combination of the words 'BLUE' and 'OYSTER cult', which refers to a type of mushroom.