That hot air balloon sure is versatile! The BGM when Twilight, Fluttershy, Applejack, Pinkie Pie, and Rarity, (the latter four having been remotivated by Twilight's memory recall spell) try to wrangle Discord-y Rainbow Dash out of her perch in "Cloudsdale."  Music by William Anderson

From S2E02: The Return of Harmony
of My Little Pony: Friendship is Magic

Also the audio is a teensy bit off from the video here, sorry.