Now my turn ;) :D
First of all: Alanah Miles "Black velvet"
Alice Cooper: "Poison"
Robin Back "First time"
Starship: "Nothing gonna stop us now"
Foreigner: "I wanna know what love is"
And songs: U2, Sting, Tina Turner and too many to mention here :D
But, I love singing duets, so 2...