Related Clues:

• Instrument quality
• When repeated, the Road Runner's cry
• Coloration
• Concern of a musician or bodybuilder
• Tenor
• What calisthenics improve
• Distinctive quality
• Strengthen, with 'up'
• Voice nuance
• Quality of voice
• Pre-dial sound
• Singer's concern
• Gridlock sound
• Phone sound
• Whole note, e.g.