While in Australia, John Mayer tweeted about how "raw" Beyonce's song 'XO' is. And then he decided to cover it himself with a guitar AND harmonica! Check out both versions and let us know which one you like better!
The best thing about Beyoncé? The break in her voice on the first "baby, love me lights out" in XO. Real and raw.— John Mayer (@JohnMayer) April 13, 2014