Related Clues:
- Concert piece?
- Rock band's accessory
- Gun, as the engine
- Crank (up)
- Rock band booster
- Sound investment for a band
- One for the roadie
- Increase, with "up"
- Mike gets juice here?
- Intensify, with 'up'
- Show off one's Harley, in a way
- Rock band need
- Concert stage item
- It pumps up the volume
- MLK Jr., for ex.