Phantom Banjo: Book One of The Songkiller Saga

This is a fantasy series about a bunch of folk musicians, good pickers and flawed but likable human beings, trying to reclaim songs destroyed by the evil forces (or devils, including but by no means limited to the Expediency Devil, the Stupidity and Ignorance Devil, and the Debauchery Devil) that want humanity to lose its humanity. Hauntings abound, as they do in the folk songs.