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.
