CSI, which featured a Coldplay ringtone last season, will work more rock 'n' roll into its scripts this fall. Well, not so much rock 'n' roll as adult-contemporary pop and terrible hip-hop. AP reports that John Mayer will promote his new album Continuum on the CBS series' two-part season premiere, 9/21 and 9/28.The Grammy-winning singer will perform his current single, ...