Related Clues:

• Observe closely
• Sol, say
• Staff leader
• One that heads up the staff
• Melody part
• Remember
• Addition to the staff?
• It may be C, F or G
• Something passed in music class?
• D or F
• It's usually first on the staff
• Importance
• Sign at the front of some bars
• Do, e.g.
• Music symbol