Related Clues:

• Singer-songwriter's key-changing tool
• Speaker's adjunct
• One coulomb per sec
• You can rock with one
• Energy drink brand
• Word on a light bulb
• Gig equip.
• Guitarist's aid
• Intensify, with up
• Intensify, with "up"
• Concert piece?
• Rock band's accessory
• Crank (up)
• Rock band booster
• Sound investment for a band