Let's say you use recycled Van Halen CDs as part of the infrastructure of a large town... ...does that mean you built the city on rock and roll? Edit: Yes, I know it was Starship that performed ""We Built This City"" (it's actually what inspired the joke). That's utterly irrelevant to the punchline, because the joke is *meant* to revolve around the fact that ***Van Halen is a well known rock band.***