A having difficulties musician realizes he's the sole man or woman on this planet who will try to remember The Beatles right after waking up within an alternate truth where they by no means existed.
So you can find leakage there. Then I claimed I would do a string quartet. The musicians objected to fiddling with headphones, so I gave them site Paul's voice and guitar on two speakers either facet of their microphones. So there is leakage of Paul's guitar and voice on the string tracks.
Immediately after recovering, he sings the Beatles tune "Yesterday" for his friends and discovers they have never heard about the Beatles.