“The Greatest Gift of All” Dolly Parton and Kenny Rogers
Any of the 10 songs from the superstar’s album of holiday duets could have made our list of the top Christmas duets, but we chose this one because it was the highest charting song from an iconic Christmas album. Once Upon a Christmas has sold over two million copies in the U.S., and another five million in Canada, making it amongst the most popular Christmas albums of all time.