Octavia Melody Philharmonica is viewed by the public as a simple mare from a wealthy lifestyle that made it big by playing the cello. But is that all there is to her? Or is there more to the mare behind the cello? After losing everything she holds dear, Octavia decides it's time to reveal the truth, and let everypony in Equestria know who she really is. It's time to reveal the secrets of Octavia Melody.

Not really a sad-fic, but sad is the most accurate tag for the story.