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Paul McCartney and David Bowie pose for photographers backstage at the Live Aid charity concert, Wembley Stadium, London, 13th July 1985. (Photo by Dave Hogan/Hulton Archive/Getty Images)

Paul McCartney and David Bowie pose for photographers backstage at the Live Aid charity concert, Wembley Stadium, London, 13th July 1985. (Photo by Dave Hogan/Hulton Archive/Getty Images)

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LONDON - 1985: Singers Paul McCartney (L) and David Bowie (R) back stage at Wembley for Live Aid in 1985, London. (Photo by Dave Hogan/Getty Images)

LONDON - 1985: Singers Paul McCartney (L) and David Bowie (R) back stage at Wembley for Live Aid in 1985, London. (Photo by Dave Hogan/Getty Images)

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LONDON - 1985: Musician's Paul McCartney (L) and David Bowie backstage at Live Aid on 13th July, 1985. (Photo by Dave Hogan/Getty Images)

LONDON - 1985: Musician's Paul McCartney (L) and David Bowie backstage at Live Aid on 13th July, 1985. (Photo by Dave Hogan/Getty Images)