The Cycologists are quite possibly the first guerrilla bicycle band. They show up unannounced, perform seven-minute long performances using instruments made out of functional parts of their bicycles, then ride off with no explanation. How amazing it must be to see their show! From their website:
The musicians include three wind players (Linsey Pollak, Ric Halstead, Brendan Hook). All the music is made with the bicycles, especially featuring: three clarinets made from the bicycle seat stems plus bicycle pump panpipes, tuned bicycle bells and a handlebar flute.