3. Stevie Nicks & Don Henley – "Leather & Lace"
The grizzly-voiced leaders of Fleetwood Mac and the Eagles, respectively, were practically born to sing together about difficult love: Their voices cracked in complimentary places and, on this 1981 hit, both sounded like they'd been caravan-ing on motorcycles across the open highway for a long time. A relationship conversation in real time, they devote the song to singing how true they promise to be to one another, but in a lonely minor key so you get the feeling they both know they're lying to themselves. But here in the moonlight, they need each other today – and for now, it's all that matters.