A having difficulties musician realizes he is the sole man or woman on Earth who can try to remember The Beatles right after waking up within an alternate reality in which they hardly ever existed.

So there is leakage there. Then I stated I might do a string quartet. The musicians objected to twiddling with headphones, so I gave them Paul's voice and guitar on two speakers both side of their microphones. So you can find leakage of Paul's guitar and voice to the string tracks.

Just after recovering, he sings the Beatles track "Yesterday" for his buddies and discovers more info which they have not heard of the Beatles.