Fetch your calendars: Mark down dates for new music from Shakira, the 'New Moon' soundtrack, Weezer, Britney, Whitney, Madonna and beyond
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John Mayer, â€œBattle Studiesâ€
Due Nov. 17. His fourth studio album and first since 2006's "Continuum," Mayer is hopefully looking for a hit with first single "Who Says," which drops at a later date. It'd be a dream if he roped in pal Taylor Swift for a verse or two, too.