Anime Natives Pro.

Kahoko Hino is a student in the General Education section of Seiso Academy. One day she runs into Lili, a musical fairy, who grants her a magical violin and a place in the school's annual musical competition. Kahoko refuses, only to be pressed on by Lili until she accepts the instrument and place in the competition. As she practices, Kahoko is amazed that she can play any musical piece as long as she knows the tune and plays it with her heart. As the competition goes on, she becomes more and more attached to the people she is trying to compete with.

Did a clip from this a few years back and decided it was time for some more! I may try to pick up some of the previous cast if I can.

CAST
Kahoko Hino: Mizura
Len Tsukimori: RobBob
Azuma Yunoki: Sukisho
Keiichi Shimizu: TBA
Kazuki Hihara: Haruhost
Ryoutaro Tsuchiura: TBA
Nami Amou: TBA
Shouko Fuyuumi: Ichigoxcupcakes
Lili: Kamuro
Mio Takato: TBA
Nao Kobayashi: TBA