Mayer's fourth studio CD debuted atop the Billboard charts upon its 2009 release. Here are note-for-note transcriptions of the singles Who Says, Heartbreak Warfare and nine more: All We Ever Do Is Say Goodbye - Assassin - Cross Road Blues (Crossroads) - Do You Know Me - Edge of Desire - Friends, Lovers or Nothing - Half of My Heart - Perfectly Lonely - War of My Life.