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Battle Studies is the fourth studio album by American recording artist John Mayer, released November 17, 2009 on Columbia Records in the United States. Production for the album took place during February to August 2009 at Battle Studies recording studio in Calabasas, California, Capitol Studios in Hollywood, and The Village in West Los Angeles, California, and was handled by Mayer and Steve Jordan.

The album debuted at number one on the US Billboard 200 chart, selling 286,000 copies in its first week. It achieved successful sales in several other countries and produced two singles that attained chart success. Upon its release, Battle Studies received positive reviews from most music critics. The album has been certified platinum by the Recording Industry Association of America and has sold 880,000 copies in the United States.

After the overwhelming success of Continuum, Mayer confessed to being intimidated about starting on a new album, however he didn't want too much time to pass without making new music. Speaking on his motivation to move on, he said "I think it got a lot easier when I realised that no matter what I do, it's not going to be Continuum, good or bad. And then that became really liberating." On October 1, 2009, Mayer posted via Twitter: "Track listing on Battle Studies is complete! Very interesting order... 11 songs. 45 minutes. Hit 'em hard and get out."

The album was leaked just hours before Mayer was scheduled to perform an official "radio leak" on 103.7 Sophie in San Diego. However, Mayer gave his listeners permission to download the leak, as long as they "registered" their copies by ordering the album.

Mayer's 2010 Battle Studies World Tour began on February 4, 2010 in Sunrise, Florida at the BB&T Center, and ended on October 1, 2010 in Manila, Philippines, at SM Mall of Asia.

According to Mayer's official Twitter profile, "Who Says" was the first single from the album and was released for preview on September 25, 2009 at www.johnmayer.com. The official release for the single was on October 13, 2009.

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Wikipedia