[ WP ] A serial killer leaves a certain song playing at every crime scene , but no one knows what it means

My cold, aluminum desk is flooded with case-files. Uptown triple-homicide. Suburban kidnapping. A few fraud cases buried underneath. I practically gag at the thought of opening any of them. 
 
 *Let'em wait... This town's goin' to shit with or without my help. * 
 
 Our precinct's department is situated in a 19th-century ex-prison. Only the chief's office and a few higher-ups' have any windows. Needless-to-say my closet stays pretty dark.. I flip on the green desk-lamp. 
 
 Before leaning back in my sunken desk-chair, I snatch a fat, yellowed file from the center of the table. Case 0333. I open it to the file's latest addition: a newspaper cutting. `` THE MUSICAL MURDERER STRIKES AGAIN! 7 KILLINGS IN 7 WEEKS!'' Pretty sad the press could n't think of a better name, in my opinion. 
 
 The blinds rattle as someone slaps at my door. Without looking up, `` What d'ya want?'' 
 
 The doorknob turns once and I hear the shake of a failed push. `` Damn piece of...'' Another twist, this time much more violent, and I look up. The door swings open revealing two long, smooth legs and a short, black skirt that could only belong to, `` Lucy! I'm busy, sugar.'' She raises a clean-waxed eyebrow. `` Detective Roll, like I've told you before, please call me Ms. Burton.'' I see her eyes slide around my mess-of-an-office and expect the usual nagging. Instead, `` There's been another one, Detective...'' 
 
 I close the file, pull my coat off the floor, and head for the door, but not without giving Lucy a friendly wink. `` Do n't wait up, hun.'' She frowns and breathes in, but I shut the door before she has a chance to chew me out. 
 
... 

