Which producer / engineer did McCartney invite to contribute to the recording ?
Studio Two , EMI Studios , London ( 2.30pm-6.30 pm ) Recording * " Every Little Thing " ( Lennon / McCartney ) ( takes 1-4 ) * " I Do n't Want to Spoil the Party " ( Lennon / McCartney ) ( takes 1-7 ) Studio Two , EMI Studios , London ( 7.00pm-10.45 pm ) Recording * " I Do n't Want to Spoil the Party " ( takes 8-19 ) * " What You 're Doing " ( Lennon / McCartney ) ( takes 1-7 ) Personnel * Musicians : John Lennon ( rhythm guitar , vocals ) , Paul McCartney ( bass guitar , vocals ) , George Harrison ( lead guitar ) , Ringo Starr ( drums ) * Production staff : George Martin ( producer ) , Norman Smith ( engineer ) , Ken Scott and Mike Stone ( 2nd engineer )