On August 14 1964 during recordings for the upcoming fourth LP to eventually be titled "Beatles For Sale", the lads entered EMI Studio 2 to record a cover version of a Little Willie John tune entitled "Leave My Kitten Alone".
Five takes were accomplished with a tambourine, piano and doubled John Lennon vocal as overdubs for the recording. The song was never issued commercially for the fourth LP, and it was never properly mixed until much later after the group had disbanded and EMI decided to take another look at the recording for future use.
There are now two mixes available for your listening pleasure. Both mixes are from the same recording (take 5 with the overdubs) but the earlier mix has a quick false start at the beginning and is not as long as the second mix. Both mixes are also mono (with a bit of stereo-ish reverb added).
You can find the earlier mix on any of the "Abbey Road Video Show" presentation bootlegs such as "File Under" and "Not For Sale"
(this is the rare one with the false start) and the later mix is found on various "Sessions" bootlegs on vinyl and CD. The song was eventually released on Apple's 3-LP/2-CD "Anthology 1" set. It's always been a mystery to me why the band decided not to release this. It's a smokin' song and it rocks !!