Related Clues:

• Any letter from A to G
• Brief bit of correspondence
• Observe carefully
• It may stick around after the office closes
• Third of a triad
• Piano key
• Do, re, or mi
• Student's permission slip
• ""Name That Tune" clue
• A flat one may evoke a wince
• Thank-you item
• Do or sol, e.g.
• Call attention to
• B flat, e.g.
• Half, quarter or eighth follower