Possible Clues:

• Death call backed by skeleton instruments — 12-6, perhaps
• “‘Come with uncle,’ I said, ‘and hear all proper. Hear angel trumpets and devil ____.’” (A Clockwork Orange)
• ''Music Man'' instruments
• Certain brasses
• Army medic right about surgeon's instruments
• Moment right to return doctor's instruments
• If it comes to blows, with a slide they come to a skeletal end