This story is a sequel to Tiara in the Rough
Sweetie-Belle has always been somewhat timid about singing in public despite possessing the best pipes among the Cutie Mark Crusaders. When she finally gains her Cutie Mark, signifying her talent in music, she is so scared of the consequences that she becomes bent on hiding it. But despite her best efforts, Diamond Tiara sees through her subterfuge and ropes her into entering a song of her own writing into the upcoming talent show. It's up to Locomotion, Lickety-Split and the Crusaders to bring the white unicorn filly out of her shell and help her wow the crowd...
As with Tiara in the Rough, this fanfic is tagged AU because it somewhat contradicts the events of Crusaders of the Lost Mark. I'd had it planned out a long time before the episode aired, and when I found out that Sweetie-Belle, Apple Bloom and Scootaloo had gained their Cutie Marks in that episode, I almost gave up writing this story. But as you see, I ultimately decided to just bite the bullet and finish off the saga that began with My Sweet Passion because I hadn't yet dedicated a story to Sweetie-Belle and Lickety-Split. Also, the final chapter of this story contains a completely original song.