What is your reaction upon seeing the inventor of the heavy guitar riff?

The year is 1974, you decide to take another shot and all of a sudden, you see appear on stage the man who was "heavy" before everyone else, dating as far back as mid 1950s, and there he is, jamming on said 1950s jam in a 1974 world.

What goes through your mind?

https://youtu.be/fHEmDLQKrrk
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