Possible Clues:

• Cousin of the banjo
• Instrument that's not musically loud?
• Instrument that's lifted things out of one's mouth
• Theorbo's cousin
• Accompaniment for a madrigal
• One instrument or another not to be played loudly
• Instrument for 19-Across
• Subject of a lesson for Katharina in 'The Taming of the Shrew'
• Protective packing for old instrument
• Banjo ancestor