By the time he released his first solo album, in 1970, he had already played on hundreds of songs as one of the top studio musicians in Los Angeles. He was in Phil Spector’s Wall of Sound Orchestra, and he played sessions for Frank Sinatra, Sam Cooke, Aretha Franklin, the Ventures and the Monkees, among many others. His piano playing is heard on “Mr. Tambourine Man” by the Byrds, “A Taste of Honey” by Herb Alpert, “Live With Me” by the Rolling Stones and all of the Beach Boys’ early albums, including “Pet Sounds.”