Related Clues:

• Indigo Girls, for one
• Indie pop's Tegan and Sara, e.g
• Bugs and Daffy in "The Iceman Ducketh," e.g
• Party involving upper-class singers?
• She & Him, e.g
• The Blues Brothers, e.g
• Half of a quartet
• The White Stripes or The Black Keys, e.g
• Ape astride back of au pair
• What Salt-N-Pepa were not, despite their name
• Rap’s City Girls, e.g
• Lead-in to decimal
• Pair (musicians)
• You and me singing together
• Couple of musicians