Related Clues:
- Whirring
- Sing with the mouth shut
- Generator's output
- Word hidden in 'instrument'
- Play a ukulele, e.g
- Fire on all cylinders
- Play guitar with your fingers
- Low drone
- Sing with your mouth closed
- Sing a wordless tune
- Sing along without words
- Make music with one's fingers
- Stink; buzz
- Neither bow nor pick
- Keep one's mouth shut?