Azure Harmony has always loved to sing. She's always been good at it, too. She knows how to sing what she loves. She always sings directly from her heart, and is happy. But there is one thing.
She's a no pony.
Well, at least to herself.
Thanks to her insecurity, no pony has ever heard her sing, and no pony ever will, it seems. She's too small, her singing is unlike any other pony she's ever heard of, and is afraid ponies will judge her for it.
Except for her sister, who is the only pony who ever hears her sing, and loves it. So you can imagine Harmony really loves her big sis.
So when her sister mysteriously disappears, Harmony is the only one who can save her with her special singing talents.
But how can she when she is so insecure? And so...afraid....