Fed up with Sweetie Belle delaying that her special talent was singing, Rarity enters her sister into a singing contest.
Of course, Sweetie Belle has something to say about it.
(Note. This story contains an Antro Robot singing. You also should read Changes For Scootaloo to understand the ages and some more info)(no spoilers)(Also, this is a cross between my universe and the FiW universe)
Art by TunDeri on DeviantART