Related Clues:

• The Little Pigs, e.g
• Group of three singers
• The Jonas Brothers, e.g
• The Musketeers, e.g
• Maroon 5, if two members were crushed by a piano (hey, a guy can dream)
• The Police, e.g
• Somewhat vitriolic, categorising some musicians
• Small group experiencing civil unrest back to front
• Pair when joined by royal?
• Players in front row, say, of small musical group
• Group of musicians — or it could be
• Riot involves a musical group
• Group of three musicians
• Group of three (musicians)
• Riot (anag)