Ray and Charles and Diana Krall "You Don't Know Me"
George Michael and Elton John "Don't Let the Sun Go Down on Me"
Kenny Loggins and Stevie Nicks "Whenever I Call You Friend"
Roy Orbison and k.d. Lang "Crying"
Tony Bennett and k.d. Lang "Dream a Little Dream"
David Bowie and Queen "Under Pressure"
Joaquin Phoenix and Reese Witherspoon "Jackson" (it's not the original, but I like it even better)