Tegan and Sara, e.g (3)
I believe the answer is:
duo
(Other definitions for duo that I've seen before include "Performing pair" , "Couple, pair" , "Musical pair" , "Pair (of people, things)" , "Two players" .)
I believe the answer is:
duo
(Other definitions for duo that I've seen before include "Performing pair" , "Couple, pair" , "Musical pair" , "Pair (of people, things)" , "Two players" .)