Related Clues:

• User-edited online reference
• Web page anyone can modify
• Sonny and Cher, e.g.
• Piece marked "piano, four hands," obviously
• Carpenters' work?
• ''Up Where We Belong,'' e.g.
• "Tea for Two," for one
• Sonny and Cher song, e.g.
• "Tea for Two" for two, e.g.
• Editable site
• Performing pair
• Musical composition for two
• Web site that users can edit
• Shared air
• "Up Where We Belong," for one