Haven't seen a thread about duets on here in a while, I guess because with a lot of indie bands it's pretty common nowadays with bands like Broken Social Scene and Dirty Projectors et al.
There's something I really love about duets, maybe it's the hopeless romantic in me, but when you get the harmonizing right you can really have something amazing. It's a fine line though between faux emotional lovey bullshit and a genuinely great sounding song.
Post your favourite duet and why with a youtube link. I'll start with this classic
It still sounds incredible to this day. Pretty interesting lyrics and manages different time signatures between verses without it sounding jarring. I want to meet this Phaedra.