The menacing masks the band wears onstage have been completely updated, but much of the music on Hollywood Undead’s third record will sound familiar to fans of its previous releases: a furious mix of metal guitars, unruly rhymes, and occasional journeys into contemporary hip-hop. But if Notes from the Underground is spiked with the band’s notoriously ill-mannered intensity, tunes like “We Are” and “Dead Bite” also show that Hollywood Undead is increasingly adept at making singles that are both shockingly vicious and broadly appealing.