December’s Hymn isn’t just a free tune, it’s a public service – an aural antidote to the homogenized holiday cheer that clogs airways this time of year. The final installment of Hymns from the House of Horror Vol. III is an infectious slice of hip-hop horror called “B-Movie Monsters.” Chokeules, Timbuktu and Savilion – collectively known as Swamp Thing – have generously offered up a cut from their debut album, Creature Feature, for your sick pleasure. And you won’t even have to crack open your kid brother’s piggy bank; like every other Hymn, “B-Movie Monsters” is absolutely free, so go here and download it before it sinks back into the swamp. While you’re there, be sure to snag the rest of this year’s Hymns. They won’t be here forever, you know.