Related Clues:

• Adjusted, as a guitar
• Ready to play, in a way
• Readied, as a musical instrument
• Tonally accurate
• Fixed a piano?
• At C when one should be at C, say
• Pitched just right
• In proper pitch
• Accurate, as a 19 Across
• Ready to strum
• Tonally pleasing
• Prepared to play, as a violin
• Pulled on someone's harp strings
• Adjusted, as a viola
• Neither flat nor 6-Across