Celeb DJ Mark Ronson spins rock and hip-hop at the kind of star-studded parties most folks never see. Like those bashes, his debut mashes up musical aesthetics willy-nilly, from Freeway jamming with Nikka Costa to Mos Def moshing with M.O.P. But Ronson's guests aren't all comfy in da club: Rivers Cuomo's whiny wallflower anthem, ''I Suck'' ...does. And the collection's overall disco-licious come-together vibe is cloying and insubstantial. Better make it a Blockbuster night.