I love duets and I am going with one of my favorite couples of all times, Marvin Gaye and Tammi Terrell (well sort of). My favorite song by this duet is "California Soul". According to Marvin Gaye (in the biography "Divided Soul") by the time this song was recorded Tammi was too ill to sing, so Valerie Simpson performed the song. I actually hear Valerie, see if you can too.
I also decided to go with Rick James and Teena Marie and the lesser known "Once and Future Dream".
fun, click here.