Flyposters are (usually) illegally erected posters on walls, bus stops, Lamp-posts and other handy objects. The illegality of the practice does not stop it being incredibly commonplace (in british cities anyway), and one of the best ways to keep up with the club scene in your local city.

I have seen walls with layers of flyposters literally inches thick; if excavated, they would be like a record of the underground music scene of leeds (where i live) over the last ten years.