Teslahead always does an excellent job with his music resources. This time around, he's shared a duet version of Art of the Dress for French horn and violin. If you're so inclined, you can find the sheet music here and play it yourself!
In addition to this music resource for Art of the Dress, teslahead also shared an original piece called Rainbow March. You can listen to the song over on Soundcloud. It's a lot of fun. You've got to love any music that's based on the awesomeness of Rainbow Dash!