 Mirkin later said that recording with the McCartneys was one of the most " amazing " experiences of his life . He flew to London and met the couple at Paul McCartney 's recording studio , where the McCartneys spent an hour recording their parts . Simpsons creator Matt Groening was supposed to go with Mirkin to London , but missed his plane . Groening commented that having McCartney and the rest of The Beatles on The Simpsons " was a dream come true for all of us . " 
