Possible Clues:

• Long horn?
• It's used extensively by bandsmen
• There's a slide in the bit of the skeleton in the end for the blower
• Right inside sepulchre, a single instrument found
• Part of the brass computer memory device, black in character
• Musical instrument with long slide
• Wind with a slide
• Brass instrument with sliding tubes
• Brass musical instrument with slide
• Brass wind instrument with a slide