You’ll never guess this one based on the photo alone -- not in a billion years. It’s almost guaranteed to stump you, simply because this guitarist is as well-known for his impossibly long, identity-concealing facial hair as he is for his music.

This sharp-dressed man is 62 years old now. But this is what he looked like as a youngin', with no chin hair whatsoever. No make no mistake, our hero's not known simply for fashion -- he's also credited with reviving and redefining the blues genre for several generations of musical lovers. Think you know who it is now?