Am I the only one who didn’t know that Alex Chilton of Big Star — of the excellent “The Ballad of El Goodo” and “Thirteen” — came to fame as the 16-year-old singer of this AM Gold classic?

Seriously? “The Letter,” by The Box Tops?

I had no idea. That 60s song and Big Star’s stuff occupy totally different parts of my brain.

Big Star videos after the jump.

Here’s Chilton emerging from semi-obscurity in 1993 with Ken and Jon from the Posies to sing “The Ballad of El Goodo”

And here’s Elliott Smith covering Big Star’s “Thirteen”

Youtube. Learn something new every day.