Octavia Concerto, the prized daughter of the rich and illustrious family of musicians, knows a life filled with luxury, fame, and music. She also knows loneliness, and the feeling of imprisonment brought on by her structured and sheltered life and the guiding hand of her proud and controlling father, whose hatred for and constant need to surpass all other musicians has made him cold and distant.

Lyra Heartstrings lives a wild and free life surrounded by crazy friends, a caring family, and more riches than Fancy Pants could even dream of. She walks the streets of Canterlot as if she owns them- and as a member of Princess Celestia's favorite orchestra, she has good reason to. The only problems in her carefree life are her family's crooked and allegedly violent rivals, the Concertos.

However, one stormy evening, these two wildly different and inherently opposed mares are thrown together by fate, and set off a chain of events that will change the face of Canterlot forever.