Before she started writing the Brother Cadfael novels, the late Ellis Peters (Dame Edith Pargeter) wrote a slew of mysteries about CID Inspector George Felse and his family. My favorite was "Black Is the Color of My True Love's Heart", which takes place at an English folk festival,in which the mystery's plot is that of a Child ballad (I won't spoil it by saying which one). She was a music scholar, so several of her earlier mysteries are from the world of classical music - "Funeral of Figaro" is about the murder of a loathsome tenor; the heroine is a young woman getting her start in opera by playing all the famous transvestite roles, starting with Cherubino..."The Horn of Roland" is another. All fine books.

Madeleine L'Engle wrote two fine adult novels about a concert pianist at different points in her life, "The Small Rain" and "A Severed Wasp", both of which deal strongly with faith and music.

For fantasies, another fine Canadian author is Tanya Huff, who has several novels about bards who can "sing" the powers in the elemental quarters, earth, air, fire, water and spirit.