Nick Cave & Kylie Minogue, "Where the Wild Roses Grow". In fact it's off an entire album named Murder Ballads.

Extra slashy version with Blixa Bargeld (of Einstürzende Neubauten) singing Kylie Minogue's part. LOOK AT THOSE TWO ZOMG EEEEEEEEE They had a long time creative partnership when Blixa was also in The Bad Seeds and a lot of people shipped them.

From the same album "Stagger Lee" (NSFW lyrics).

More Nixa (yes they have a portmanteau name!) slashy goodness. (One of the two of them said in an interview "We look like two gay businessmen at a disco.")