Two Cycles is a system for performances in the urban environment composed in principle by two bicycles in motion. Every bicycle has a small laptop computer; the laptops are interconnected via a mobile ad-hoc wireless network. Thanks to the network the laptops can share data. The data shared by the computers is translated in real time into sound. Two Cycles has been performed seven times: in Santa Barbara, California in 2008. In Geneva, Switzerland in 2008. In Madrid, Spain in 2010. In Sao Paulo, Brazil in 2011. In Hangzhou, China in 2012, Etc. The project runs almost 100% in free and open source software -linux, ubuntu, pude data, processing, etc-.