John Clayton Mayer is an American singer, songwriter, guitarist, and record producer. Born in Bridgeport, Connecticut, Mayer attended Berklee College of Music in Boston, but disenrolled and moved to Atlanta in 1997 with Clay Cook. Together, they formed a short-lived two-man band called Lo-Fi Masters.

Battle Studies is the fourth studio album by American recording artist John Mayer, released on November 17, 2009 by Columbia Records. Production took place from 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.

关于这张专辑，John Mayer解释说：“这次曲风是以抒情蓝调和灵魂乐为主，是一张重新发现自我、探索人性的专辑。”专辑还将特别收录John Mayer上张Live专辑中的《Vultures》和《Gravity》两首单曲的录音室版本，以及翻唱Jimi Hendrix的 《Bold As Love》。此张专辑也继续和Steve Jordan, Pino Palladino合作..