Hondo "Magnum" Flanks and Cookie Crumbles's anniversary is coming up, and Rarity has the perfect gift in mind for her parents. She and the Ponytones are going to give them a surprise performance at their anniversary dinner. And when she discovers that poor Sweetie Belle completely forgot about this momentous occasion, she offers her the opportunity to perform alongside the Ponytones as part of her present.
Unfortunately, Sweetie Belle doesn't seem to be too keen on the idea. She loves to sing, sure, but not in front of large crowds. Plus, she thinks that Rarity's singing voice is much better than hers will ever be. Rarity has a suspicion that there's something being left unsaid, but Sweetie Belle isn't willing to open up to her sister.
Luckily, Rarity has a close friend who was in a very similar situation not too long ago. And who better to confide in than somepony that knows exactly what you're going through?