Oldies but goodies

So I might be obsessed with SYTYCD but that's ok with me!

http://www.youtube.com/watch?v=sjlDfd7iMj8 < AMAZING DISCO

http://www.youtube.com/watch?v=OUuHK3csqEs < one of my all time favorites

http://www.youtube.com/watch?v=kt650DW6YqA < so amazing!

http://www.youtube.com/watch?v=V0kImsIcfYY < so sorry this one isn't better quality. . .
Ok, I think I'm done for now. . . there are soooo many good ones though!