Erik Brann left the band after a final show in San Diego on December

Erik Brann left the band after a final show in San Diego on December 13, 1969. Brann was frustrated with the band’s unwillingness to move towards a harder rock sound. He was replaced in the line-up by two new musicians: guitarist/vocalist Mike Pinera (whose Blues Image had opened for Iron Butterfly’s Vida tour) and guitarist Larry Reinhardt (from the Allman Brothers Band forerunner Second Coming). Both Pinera and Larry “Rhino” Reinhardt had been rehearsing secretly with the band since September 1969 after Brann had voiced his objections to continuing. In August 1970 Iron Butterfly released its fourth studio album Metamorphosis . The album managed to get into the Billboard top 20.