Stumbled Onto this Gem

So I stumbled onto this little gem the old fashioned way. I am trying to work on that guy's logo and I wanted to pursue a sound wave angle so I did a google image search for sound lines, and I found this (make sure to click to see full size).

I almost missed it, even though I was looking at it, I was so intent on analyzing the clarity of the sound waves, that I almost missed the point. Fortunately, I didn't quite overlook it. Thank you, and no StumbleUpon necessary.