Battle Studies is John Mayer's fourth studio album and was released in 2009. The album - which he produced himself - debuted at number one on the US Billboard 200 chart, selling over 200,000 copies in its first week. It achieved successful sales in several other countries and produced two singles that attained chart success. The album has been certified platinum in the United States. In Europe the album produced four hits : "Who Says", "Heartbreak Warfare", "Half of My Heart" (ft. Taylor Swift) & "Perfectly Lonely". Battle Studies is an elegant and soulful album that shows an effortlessly seductive and somewhat irresistible John Mayer, the one who's loved by many. As of now available again on heavy duty vinyl. 180 gram audiophile vinyl Gatefold sleeve Printed innersleeves Includes the hits: "Who Says", "Heartbreak Warfare", "Half of My Heart" & "Perfectly Lonely"