Yes. I attempt it all the time with "A Whole New World, " "A Heart Full of Love" (HARD. Even when I don't do Eponine), "All I Ask of You"... now, I know it's not a duet, but "One Day More" is the absolutest hardest song ever to sing by one's self, and yet I try over and over and over. I'll never learn that I can't do it. -funny thing is i didnt right that! But it is so true!!!!