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John Mayer - Battle Studies Battle Studies is the fourth studio album John Mayer, released on November 17, 2009, by Columbia Records. Album Tracks 1. Heartbreak Warfare 2. All We Ever Do Is Say Goodbye 3. Half of My Heart 1. Who Says 2. Perfectly Lonely 3. Assassin 1. Crossroads 2. War of My Life 3. Edge of Desire 1. Do You Know Me 2. Friends, Lovers or Nothing
