Although nominally a rap group, Black Eyed Peas call upon so many forms of songwriting and production that slotting them into hip-hop is like slotting Prince into R&B – technically true, but very limiting. Elephunk, the group's third LP (and the first to feature Fergie), doesn't have top-notch rapping, but as driven by frontman Will.I.Am, it does possess some of the most boundary-pushing productions in contemporary, (mostly) uncommercial hip-hop, right up at the level occupied by Common and OutKast….