Related Clues:

• Fiddle with a lute, say
• Sign of smooth operation
• Act the troubadour
• Sing with lips closed
• Doodle on the guitar
• Smooth engine sound
• Low murmur
• Make a banjo heard
• Play a stringed instrument (badly)
• Brush strings
• Tickle strings
• Play the kazoo
• Steady drone
• Beehive sound
• Play music in street with spirit