Related Clues:
- Strum monotonously
- Fail to know the words, maybe
- Sign of smooth operation
- Sing with lips closed
- Dull tapping sound
- Smooth engine sound
- Low murmur
- Play the guitar, say
- Tense drone across electric resistance with guitar beat
- Play the kazoo
- Play lazily, as a guitar
- Beehive sound
- Finger-tapping sound
- No end to the peculiar beat
- Strum; thread end