Okay, it's just an animated GIF and you'll have to imagine the music, but here's Pinkie Pie doing the world-famous Chicken Dance. Okay, not the whole thing (she skips the bridge), but still.

If you've never heard or seen the Chicken Dance, here it is: http://www.youtube.com/watch?v=6UV3kRV46Zs (Skip to 0:48 for the start of the music.)

Now Pinkie is ready for Oktoberfest!

EDIT:  timkangaroo has put this animation together with music: http://www.youtube.com/watch?v=Kwq5VhoU1Yk&loop=1