"Vikram Vikram", by Kamal Hassan and Illaiyaraaja. This is why I spend half my waking hours scouring the internet for music. (Memo to my employer: this is not, in fact, true.) I can almost guarantee that you have never heard anything like it in your life. And yet elements of it are very familiar: everything from Tom Tom Club to Bob James to Giorgio Moroder to (I swear) Tha Dogg's "Drop It Like It's Hot".
You owe it to yourself to click your way over to the estimable XXJFG and download the damn thing, while it's still up. Even if you only listen to it once. Which you won't.