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So you can find leakage there. Then I claimed I would do a string go here quartet. The musicians objected to fiddling with headphones, so I gave them Paul's voice and guitar on two speakers either facet in 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 which they have never heard about the Beatles.