New single reviews: Grizzly Bear's piss-soaked bedsheets are hung over the balcony railing, the Manic Street Preachers remind us why their politics and music never set Yankee charts afire, Amerie watches with amusement, Charlie Wilson drops a really big bomb on us, baby, Clipse and Kanye West release a track that's kinda no big deal, Rob Thomas struggles against his genetic boringness, and Keyshia Cole is boring, period.