How many people remember "Signs" by Five Man Electrical Band? I've been surfing around YouTube again and ran across that old favorite from the '70's that's been set to slideshow. What I found interesting is that the video didn't make a whole lot of use of modern digital signage. I am not a hamster, that would have helped bring it into the 21st century just a bit more.
In any event, I think that this song is as relevant today as it was back in the day, especially if you pay attention to the messages in an incredible number of signs that are in use today.