Related Clues:

• Batman and Robin, e.g.
• Music for two
• Twosome
• Brace
• Husband and wife, e.g.
• See 20-Across
• Tonto and the Lone Ranger
• Couple
• Laurel and Hardy, e.g.
• Pair
• Decimal starter
• The Righteous Brothers, e.g.
• Sonny and Cher, once
• Prefix with tone
• Musical work