Doug Ingle, who sang, wrote and played organ on “In-A-Gadda-Da-Vida,” the haunting 1968 hit by rock band Iron Butterfly, died Friday, as previously reported by Ultimate Classic Rock. Ingle was 78. A cause of death hasn’t been released. On Facebook, the musician’s son, Doug Ingle Jr., wrote, “It’s with a heavy heart & great sadness to announce the passing of my Father Doug Ingle. Dad passed away peacefully this evening in the presence of family.” Ingle’s son concluded his Facebook tribute with, “Thank You Dad for being a father, teacher and friend. Cherished loving memories I will carry the rest...