Shattered Rhythms by Phyllis Knight

If private investigator Lil Ritchie has one regret in life, it would be that could not play the guitar for a living. But her current profession does have its advantages. For instance, because she is her own boss, she is able to catch every New England concert of Andre Ledoux, the legendary jazz guitarist. So when Ledoux disappears and Lil is asked to find him, she readily agrees. After all, it is a paid trip to the Montreal Jazz Festival and maybe a change to hang out with Ledoux in the bargain. But this bargain turns costly when murder rears its ugly head...