Here's a duet that landed in my e-mail box the other day, by a lesser known singer named Lior and Sia, who's a personal favorite of mine. The duet, which was on Lior's album Corner of an Endless Road, is a nice acoustic affair - soft and laid back, but a very sad song. I find it to be a relatable song:
"I've made up my mind, I'll forget you in time."
I'll Forget You - Lior and Sia