There are conflicting accounts of how the”Yesterday” was recorded, the most
quoted one being that McCartney recorded the song by himself, without bothering
to involve the other band members. Alternative sources, however, state that Paul McCartney and the other Beatles tried a variety of instruments, including drums
and an organ, and that George Martin later persuaded them to allow McCartney
to play his Epiphone acoustic guitar (above), later on editing-in a string quartet
for backup. Regardless, none of the other band members were included in the
final recording.