Paul & Adam

There's a commercial featuring Paul McCartney; I think it might be for American Express. They show clips from his career while he sings. Everytime I hear the vocals, I think it's Adam Sandler singing the tune he wrote for Drew Barrymore on the flight to Vegas in "The Wedding Singer." How on earth does Adam Sandler sound like Paul McCartney?! I think it's the tune more than the voice!