Uses
Bicycles have been and are employed for many uses:
Working bicycle in Amsterdam, Netherlands
Utility: bicycle commuting and utility cycling
Work: mail delivery, paramedics, police, couriering, and general delivery.
Recreation: bicycle touring, mountain biking, BMX and physical fitness.
Racing: track racing, criterium, roller racing and time trial to multi-stage events like the Tour of California, Giro d'Italia, the Tour de France, the Vuelta a Espana, the Volta a Portugal, among others.
Military: scouting, troop movement, supply of provisions, and patrol. See bicycle infantry.
Show: entertainment and performance, e.g. circus clowns.
As a novelty musical instrument; e.g. Frank Zappa and P. D. Q. Bach.