Possible Clues:

• Series of rapidly ascending or descending musical notes
• Slidings involved with a series of notes
• Slides, as with sliding rocks
• … represented as sliding scales
• Sliding scales scorers devise to engage players?
• What in music could be represented as sliding?
• Slide over the keys making signals to detective
• Slides sliding off, it separates
• Dramatic musical effects
• Players may perform them, sliding as erratically