Doug Ingle, who co-founded the heavy rock band Iron Butterfly and was the singer and organist on songs including their signature hit, “In-a-Gadda-Da-Vida,” died Friday at age 78. He was the last surviving member of the classic lineup from the late 1960s. Most of Iron Butterfly’s success came with the 17-minute FM radio smash “In-a-Gadda-Da-Vida.” […]