This year, we've wrapped our roundup of holiday albums a bit differently. Instead of delivering it to you in one big lump (like coal), we're parceling out the reviews online, with a blog each weekday through December 24 devoted to recordings in a different category. Part four features "Variety Packs" -- six new compilations that draw from styles like metal, pop, alternative (sort of), Latin music and, well, sexiness. Slip that in your stocking.
