Fiction by Tess Gerristen.
Tess Gerristen is known for her "Rizzoli and Isles" series of books, but this is not one of those, and that's why I picked it to read. (I've mentioned before the trouble I have with serial mysteries, click here to read that if you're interested.)
The story in Playing with Fire centers around a piece of violin music (which the author apparently actually composed as a companion to the novel, although I haven't listened to it). The mysterious music is a link with the past and seems to threaten the protagonist's ordered life.
It's an exciting thriller, and a short read.