Related Clues:

• Catch up to gold singer
• Adult male voice
• General sense
• Barbershop part
• Deep male voice
• Part of orchestra lacking right instrument
• Samuel Ramey, for one
• Marcello Giordani, for one
• The Met's Paul Plishka, for one
• Ezio Pinza, e.g
• Amp knob
• Barbershop quartet harmonizer
• General meaning to expand number of regiments, initially
• Low voice range
• NSYNC member Lance...or the voice part he sang :o