One-time Yardbirds bassist Paul Sawwell-Smith produced Cat Stevens' biggest hit, "Morning Has Broken." The tune came about while Stevens was browsing in a religious bookstore. A book of hymns caught his attention with one of the songs piquing his interest. He later adapted the lyrics to his original music. With lyrics by Eleanor Farjeon and music by Cat Stevens, assisted by Rick Wakeman on piano, the gentle "Morning Has Broken" went to number six pop and number one adult contemporary during the summer of 1972. Stevens and Sawwell-Smith collaborated on the singer's other hits, including "Peace Train," "Wild World," "Where Do Children Play," and "Oh Very Young."