"I woke up with the song in my head called 'Half of My Heart.' And the idea is that it's this real sort of updated — not that it needs to be updated — sort of Tom Petty, Fleetwood Mac, Stevie Nicks thing. I thought, 'Well, if this is going to be my love letter to that style of music, who's going to be the Stevie Nicks in this equation?' And I thought, 'This Taylor Swift girl is going to be around for a long time.'"
-Singer, songwriter, guitar player and Internet meme aficionado John Mayer, talking about his collaboration with Taylor Swift. "Half of My Heart," which hit the Web on Thursday, comes from Mayer's upcoming album Battle Studies. Not surprisingly, the first seeds of the collaboration were planted on Twitter, where both Mayer and Swift are skilled regulars. He expressed a desire to work with her via the microblogging service, though he's not certain that's exactly how it came together. "You know what? It's like the tweet version of 'The Secret' — no better way to put it out into the universe than to tweet it. But then it's not like she reads the tweet and goes, 'I'm in,' although she may have. I don't remember." Mayer's Battle Studies hits stores on November 17 (the same day he plays a special celebratory album release show at New York City's Beacon Theater), while Swift has more immediate plans, as she's hosting and serving as the musical guest on this weekend's edition of "Saturday Night Live."