Herman's Hermits Heartbeat", "Leaning on a Lamp Post", "Mrs. Brown, You've Got a Lovely Daughter", "A Must to Avoid", "You Won't Be Leaving", and "I'm Henry VIII, I Am" (the last said at the time to be "the fastest-selling song in history"). Leckenby soloed on "Henry", and Hopwood played rhythm guitar on "Mrs. Brown". Despite the group's competent musicianship, some subsequent singles employed session musicians – including Big Jim Sullivan, Jimmy Page, John Paul Jones, Vic Flick and Bobby Graham – with contributions from the band, although the role of session players on Herman's Hermits records has been exaggerated in the rock
Booker T. & the M.G.'s for session work, and on several sessions Jones and Hayes played together with one on organ, the other on piano. However, Hayes was never a regular member of the M.G.'s, and Jones played on all the records credited to Booker T. & the M.G.'s, with one exception: the 1965 hit "Boot-Leg", a studio jam with Hayes playing keyboards in Jones's place. According to Cropper, it had been recorded with the intention of releasing it under the name of the Mar-Keys (the name had sometimes been used on singles by the Stax house band). However, as recordings credited to Booker T.