Related Clues:

• 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 four musicians
• Group of three (musicians)
• Stringed group
• Two violins, viola and a cello string group
• Riot (anag)
• String group?
• Band of three