A couple of (hopefully) silly and/or touching stories set around or after the events of Rainbow Rocks.

Adventures of the Royal Equestrian Courier Service
How Sunset's letter-book came to lie on top of Twilight's cart, and how it was not even nearly lost to highway robbery. Featuring the Cutie Mark Crusaders.

Music in our Hearts
During a break in band practice, Sunset Shimmer is asked how she learnt to play the guitar.