Related Clues:

• The Dixie Chicks and others
• Some Grammy winners
• Bob and Carol and Ted and Alice
• Pet Shop Boys and Eurythmics, e.g.
• Classical-music movements
• Six-legged bands
• The Dixie Chicks and the Dixie Cups
• The Smothers Brothers and others
• Simon & Garfunkel et al.
• Many comedy teams
• Some acts
• Pairs of pairs
• Sextet halves
• Batman and Robin and Abbott and Costello
• Backup groups, often