Related Clues:

• Chamber group often including a piano
• The Police, most of the time
• Wynken, Blynken and Nod, e.g
• Salt-N-Pepa, e.g
• Three blind mice, for one
• Cream, for instance
• It doesn't qualify as a duet
• "Riot" anagram
• Peter, Paul and Mary, e.g
• The Police, e,g
• Small bar band
• The Andrews Sisters, e.g
• Rush, e.g
• Peter, Paul & Mary, e.g
• The Supremes, for one