The magic of harmony was well known, as was the study of magical music, But the study of harmonious musical magic was a new field that had emerged of late. Equestria had been at peace for over a thousand years, and the latent harmony built up over the centuries. A by-product of such peace has started to affect the magic around them. The power of song and music was one such thing that baffled the magical community. It was with this that Twilight was determined to unlock its answers.