John Phillips may easily be called one of the best pop songwriters of the later 20th century. He honed his songwriting and arranging skills with singing groups that gained a modicum of success. But his crowning musical achievement was the work he did with his '60s group the Mamas and the Papas. Their popularity helped to stem the tide of the "British Invasion" of the 1960s, and bring attention back to American popular music. After a stunningly successful three-year run, the band collapsed under the weight of personal tensions, and seemingly so did Phillips. His later challenge...