She's holding that bassoon backwards, but I suppose it does show off the keys better that way. I'm not sure how she plans to play it with hooves though --it's hard enough even with ten fingers. My bassoon has nine keys for the left thumb alone and four for the right (I have a Fox 240; other models have more or less). And the holes on the front would be even harder for a pony, especially on an E-flat when you have to cover the top and bottom ones but not the middle. Oh well, Pinkie Pie is used to breaking physics anyway so I'm sure she'll be fine.