Dance Central 3 downloadable content catalog is on sale through June 3. The routines are 50 percent off at 160 Microsoft Points ($2) apiece, with over 80 tracks featuring original choreography available - don't worry, Gangnam Style still features the horsey move.
Developer Harmonix is also offering dance packs for particular tastes. You know, if you only want Fergie, Rihanna or the Biebs at an even greater discount. Some of those tracks are listed after the break, the full list can be found on Harmonix's DC3 site.