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Paul with Long John Baldry"Baldry became friendly with Paul McCartney after a show at the Cavern Club in Liverpool in the early 1960s, leading to an invitation to sing on one of The Beatles 1964 TV specials, Around The Beatles. In the special, Baldry performs "Got My Mojo Workin'" and a medley of songs with members of The Vernons Girls trio; in the latter, the Beatles are shown singing along in the audience."https://en.wikipedia.org/wiki/Long_John_Baldry
From what I recall, this photo of Paul with Long John Baldry was taken just outside Lime Street Station.