Story 
“Mr. Moonlight” is a song written by Roy Lee Johnson and recorded by Dr. Feelgood and the Interns in 1962. [Wikipedia]
Mr. Moonlight is a song by The Beatles, written by Roy Lee Johnson and led on vocal by John Lennon. Often listed among the worst Beatles tracks; Hammond organ break by Paul. Within the catalogue, its cover thread connects it to Anna (Go to Him), Chains, Boys; its divisive thread connects it to Ob-La-Di, Ob-La-Da, Revolution 9. Often catalogued among lesser Beatles recordings, this Dr. Feelgood cover (14 August 1964) features Paul's Hammond organ break—a rare Beatles keyboard departure from George Martin's piano tradition. The divisive critical reception masks experimental production ambition: organ plus standard rhythm section plus John's gritty vocal required careful overdub sequencing (Lewisohn 1988, p. 50).
The session work falls within the band's Beatlemania (1962–1964) period, recorded 14 Aug 1964 at EMI Studios, Abbey Road. George Martin produced; Norman Smith engineered. For session-by-session detail, see Mark Lewisohn's account on p.48 of The Complete Beatles Recording Sessions. The session required overdub work balancing Paul's Hammond organ prominence against John's lead vocal clarity. The organ break represented studio experiment—testing instrumental colour beyond guitar-bass-drums core—presaging later Rubber Soul keyboard exploration. George Martin's production direction guided the unconventional arrangement (Lewisohn 1988, p. 50).