"Baby I Love You" as performed by Bonnie Raitt and B.B. King
Because I love when men and women really talk to each other, I love male-female duets, especially this one, where lucky you and I actually get a male-female quartet: her guitar (all its buttery desire) and his guitar (all precise urgency, equally desirous), plus her voice and his, each of them as euphonious as you could want. Because all four of them know what's what, that's a lot of talking going on, but overkill it ain't: four interactions of atoms are telling each other that they love each other, and there aren't sounds enough in the universe to nail that one down. It takes a lot of playing and singing, a lot of consultation. Ironically enough, here it's a queen and a king showing us how to talk to each other.