It's no surprise that video game sales continue to fall— off 5 percent in January. And as expected Activision Blizzard's "Call of Duty: Black Ops" topped the list. The big surprise is the fact that dance games are thriving, with three dance games in the list of the top ten bestsellers.

Just Dance 2 Wii

As music games decline — Activision Blizzard is shutting down its once popular 'Guitar Hero'franchise — there's been plenty of speculation that people just aren't willing to pay for more casual games, and only big franchises targeting 'hard core gamers' can succeed. The rise of the dance genre proves that's far from the truth. It' just a simple shift in trends: dance is in but music is out.