It's been so cold here in the Midwest, it's easy to forget that winter doesn't officially begin until December 21st. While it's not warm and fuzzy like chestnuts roasting on an open fire, B.o.B's new single "Throwback" delivers some much-needed heat. Featuring your favorite R&B sanga-turnt-rappa, Chris Brown, "Throwback" is a bass-driven offering with a crazy looped vocal sample that sounds fit for the Riverdance crowd instead of rappers. And yet, this odd pairing has produced a marriage of sound that is both infectious and borderline hypnotic. While the December 17th release of his upcoming album "Underground Luxury" fast approaching, you can listen to a sampler if "Throwback" isn't enough to hold you over in the meantime.