John Mayer "Half of My Heart" (with Taylor Swift)

John Mayer just realead his fifth studio album "Battle Studies" on 17 movember 2009.
"Who Says" is the first single off the album, It was released for preview September 25, 2009 at www.johnmayer.com. The official release for the single was October 13, 2009.
The second single is "Heartbreak Warfare", which began being previewed on October 19, 2009. The first ever augmented reality video accompanies the second single, which was released on the same date on Mayer's website.
And the thirs single is " Half of My Heart" featuring Taylor Swift.

Download John Mayer Battle Studies Album