Quite a while ago, I found a few pictures of Rod Argent in Abbey Road in 1973:
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Recently, the Beatles tweeted about "Lady Madonna" and included a clip of the promotional film. The same piano is in that footage (the music rack matches):
As this video explains, the footage that was used to create the "Lady Madonna" video was actually shot when the Beatles were recording "Hey Bulldog," so the same piano heard in "Hey Bulldog" can also be heard on whatever Argent was recording when these pictures were taken in 1973 (probably In Deep or Nexus).
