From the television series CSI. This murdered (pervert) rock star was killed by the "minature killer" serial killer, so called because he/she leaves an incredibly detailed miniature model of the crime scene at the crime scene. Izzy became a chicken rights activist against Mannleigh Chicken.
Played by former Partridge Family member Danny Bonaduce.
Also Gary Sinise's detective character Mac Taylor is a bass player in a jazz band, revealed in episode 214, "Stuck On You".
Also Warrick Brown dates a jazz singer over several episodes. They break up when he finds out she's on heroin. What's her name?