Formed in San Diego in 1966, Iron Butterfly became pioneers of the heavy psychedelic rock sound that bridged the gap between the late 1960s and the hard rock that followed. Best known for their groundbreaking hit “In-A-Gadda-Da-Vida,” the band combined hypnotic organ riffs, thunderous drums, and distorted guitar textures to create a signature sound of the era. Their 1968 album of the same name achieved multi-platinum status and cemented Iron Butterfly’s place as one of rock’s earliest and most influential heavy acts.