John Mayer

In frat houses everywhere, an acoustic cover of "Your Body Is a Wonderland" closes the deal with a Jessica Simpson look-alike 90 percent of the time. In Hollywood, John Mayer simply walks into the Ivy. The 32-year-old musician has long been recognized as the alt-bro Stevie Ray Vaughan, thanks to serious chops and a tubby guitar style he once likened to Sting's effusive baritone. He has also immortalized the quarter-life crisis, celebrity Twitter account, and melodic relationship ballad. Thanks to "Who Says?" Mayer's first single off his latest album, Battle Studies, here's another landmark: the wake-and-bake trip to Japan.