We sure do have a lot of Rainbow Dash vocals. Have two more for the list! The first is a bluesy song, followed and a Red Hot Chili Peppers parody, and finishing off with some Dash rap.
1.) MLP: Rainbow Blues (Pony Song)
2.) Alicornication-MLP FIM-Red Hot Chili Peppers parody
3.) Rainbow Dash: Obscure [Rap - Smooth]