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So there is certainly leakage there. Then I mentioned I'd do a string quartet. The musicians objected to twiddling with headphones, so I gave them Paul's voice and guitar on two speakers possibly aspect of their microphones. So you can find leakage of Paul's guitar and voice to the string go here tracks.
After recovering, he sings the Beatles track "Yesterday" for his pals and discovers that they have not heard of the Beatles.