In the following score, why don't they just write the notes on the bass clef. It would make things much easier to read. You get points if you know what song it's from. It's a rock n roll song from the 70s.
This is only a guess on my part, and I've been wrong many times before, but it appears to be an attempt to multiply the number of octaves lower than middle C to be displayed in the sheet. I have to say I wouldn't have thought to do it this way myself. Here's another quick guess from just looking at the rhythm of the piece. Is it Dom-Diddy Dom Dom by Manfred Mann?