Lyric discussion by GlitterGlue 

who plays piano in the background of this song, paul?

@GlitterGlue Sounds like Lennon. He usually played in a plaintive way, and liked to effect his own bass lines in the lower register, and process the sound "tinny" like that. You heard this kind of playing in his early solo work (e.g., "John Lennon/Plastic Ono Band").

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