He played xylophone and bells on the 1966 single "The Joker Went Wild", sung by Brian Hyland and written by Bobby Russell (no relation to Leon). He also contributed to recording sessions with Dorsey Burnette and with Glen Campbell, whose 1967 album "Gentle on My Mind" credited him as "Russell Bridges" on piano, and arranged and conducted the 1966 easy listening album "Rhapsodies for Young Lovers" by the Midnight String Quartet. He co-produced and arranged hits by Tom Northcott, including "Sunny Goodge Street" in 1967, written by Donovan.