Related Clues:
- Air-conditioning sound
- Play with strings
- Sweep a thumb across
- May sounds with a closed mouth
- Play a guitar, perhaps
- Sing with one's mouth closed
- Not quite sing
- Drum starter?
- Make some dulcimer music
- Vocalize on a kazoo
- Play idly, as a guitar
- Sing with a closed mouth
- Smell and sound of bees
- Smooth machinery sound
- Half the people on earth smell