Everybody, have you heard?

I think everybody probably has, but I was listening to the radio tonight when they played this completely awesome song that I've never heard before. A bit of internet research reveals that it's been covered by everybody in the universe and featured in no end of films and TV shows that I've heard of but not seen. But now I've officially added it to my mental list of great songs that I'm aware of the existence of. I wonder how many other classics there are out there that are still avoiding me?