ear ly ▁mix ) ▁Mo og ▁Syn thes izer : ▁M icky ▁Dol enz ▁Ear lier ▁mix ▁features ▁mo og ▁synth es izer ▁instead ▁of ▁string ▁section ▁Record ed ▁at ▁United ▁Record ers , ▁Hollywood , ▁California ; ▁December ▁ 2 6 , ▁ 1 9 6 7 ▁ ▁The ▁Girl ▁I ▁Left ▁Be hind ▁Me ▁( second ▁recorded ▁version ) ▁Writ ten ▁by ▁Car ole ▁Bayer ▁S ager ▁and ▁Neil ▁Sed aka ▁Le ad ▁vocal : ▁Dav y ▁Jones ▁Other ▁personnel ▁unknown ▁Record ed ▁at ▁R CA ▁Victor ▁Studios , ▁Hollywood , ▁California ; ▁October ▁ 3 1 ▁and ▁November ▁ 7 ▁and ▁ 2 1 , ▁ 1 9 6 7 ▁ ▁Lady ' s ▁Baby ▁( altern ate ▁mix ) ▁Writ ten ▁and ▁produced ▁by ▁Peter ▁T ork ▁Le ad ▁vocal / gu itar : ▁Peter ▁T ork ▁Back ing ▁vocal : ▁Kar en ▁Har vey ▁Ham mer ▁Electric ▁guitar : ▁Stephen ▁St ills ▁Bass : ▁L ance ▁W ak ely ▁Dr ums : ▁De we y ▁Martin ▁Sound ▁effects : ▁Justin ▁Ham mer ▁Record ed ▁at ▁R CA ▁Victor ▁Studios , ▁December ▁ 1 , ▁ 1 7 , ▁ 2 1 , ▁ 1 9 6 7 , ▁and ▁January ▁ 1 4 , ▁ 1 9 , ▁ 2 4 , ▁ 1 9 6 8 ; ▁Western ▁Record ers , ▁Hollywood , ▁California ; ▁February ▁ 2 ▁and ▁ 7 , ▁ 1 9 6 8 ▁Constant ▁production ▁changes ▁and ▁re - record ings ▁resulted ▁in