Related Clues:

• Tuning fork's output
• Do, e.g.
• It's passed in class
• Instrument quality
• Folding money
• Post-it, e.g.
• Coloration
• Brief communication
• Post-it message
• Concern of a musician or bodybuilder
• Do, for example
• Tenor
• What calisthenics improve
• Memorandum
• Memory jogger