Magia the Ninth Vol. 1 (manga)

High school student Sumura Takeru has a dark secret: his parents were murdered by demons. Consumed by vengeance, Takeru seeks out the famed demon hunter, Beethoven. Beethoven is a "magia," a wizard who wields the power of music to battle demons. Taken under Beethoven's wing, Takeru joins the ranks of other renowned magia: Bach, Mozart, Schubert, Liszt and Tchaikovsky. This unique team of demon hunters will use their music-based magic to combat the world's demons. Now all Takeru needs to do is figure out how to convince Beethoven to upgrade him from his personal cleaning boy to a full-fledged apprentice!