Have you ever wondered how Elvis Costello (@elviscostello) and Paul McCartney (@paulmccartney) met? It was all thanks to a very young Mary McCartney (@marymccartney). We were live last night at the NYC Premiere of #IfTheseWallsCouldSing, an intimate look into the historic Abbey Road Studios. Directed by Mary McCartney, streaming on December 16th. #PaulMcCartney #ElvisCostello #TheBeatles #Wings #DisneyPlus #DisneyOriginalDocumentary #MaryMcCartney