Imagine Robert Plant showing up to one of your gigs and joining you on stage...

superchuck500 said

I don't think that's the first time either - there's various stories like that through the years. I think he likes to record in New Orleans.

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I remember reading about the time that Paul McCartney played piano and sang at the Court of 2 Sisters restaurant in the early 70s.
I believe that he was down there for a recording session at Allen Toussaint's studio around that time.