1.  “The Little Drummer Boy” – Bowie & Bing

2.  “Baby, It’s Cold Outside” – Rod Stewart & Dolly Parton

3.  “White Christmas” – Bing & Frank

4.  Any song done with Elvis and another artist.  The King sings ALONE!

5.  “Do You Hear What I Hear” – Elmo & Rosie O’Donnell

6.  Any duet including Cyndi Lauper