Possible Clues:

• It's plucked
• Sounds as if you couldn't believe you'd be able to pluck it
• What Orpheus plucked
• Component of fairly recondite instrument
• Instrument
• Dishonest-sounding instrument
• The strings don't sound true there
• Sounds as if you can't believe that there are strings attached
• Ancient musical instrument - sounds mendacious
• Instrument taking part in costly recital