John Lennon admired one Beatles song that Paul McCartney wrote. He liked it so much it infuriated him that he didn't write it.

Paul McCartney has spent decades crafting some of the most beloved songs in music history, but even legends have regrets. When looking back at ‘When I’m Sixty-Four’, one of his earliest compositions for The Beatles, McCartney admitted that he may have made a mistake in the lyrics.

Paul McCartney, 82, hosted a surprise show at the Bowery Ballroom in New York City on Tuesday night, after announcing the pop-up concert just hours earlier.