Possible Clues:

• Singing group of three
• The Three Tenors, e.g
• "Jeopardy!" contestants, collectively
• Lady Antebellum, e.g
• Cream, e.g
• Rush, e.g
• Donald Duck's nephews, e.g.
• Huey, Dewey and Louie, e.g
• Jazz __
• The Jimi Hendrix Experience, e.g.