The three little piggies Mario, Luigi and Yoshi The three stooges Three blind mice Ron, Harry and Hermione Huey, Duey, Luey Courtney, Tenley and Kaitlyn Powder Puff Girls Cheetah Girls
You could be thinking of the Spanish singers Plácido Domingo and José Carreras and the Italian singer Luciano Pavarotti, who sang together during the 1990s as The Three Tenors. Read more, below.