Thanks to @rosbif, I have had the pleasure of hearing a new song from Shakespears Sister. They’ve been away too long (26 years), and the delightful tension of their rivalry which extends even to their contrasting vocal styles is present as it was in ‘Stay’, etc.

It makes me want to hear other examples of duets that delight, bringing contrasting styles that draw out the best of each performer. Can you help me out with your favourites?