A sword of Damocles hangs over the heads of media artists regarding their disproportionately negative ecological footprint. The reflection on energy efficiency and sustainability in media artistic production is inevitable. The interactive installation Composing on Wheels represents an energy-autonomous stand-alone solution for the production of electronic music, powered by the creative energy and muscle power of the visitors in a collaborative effort. Up to two visitors sit and pedal on bicycles to power up the installation: to this purpose, two modified bicycles are connected to belt-driven generators, which power a sensor-controlled device consisting of an energy-efficient single-board computer and several photo-resistors. Using this device, other visitors can make custom graphic notations sound, for which rhythms and sound progressions of musical phrases are individually designed on paper. The installation makes the necessary energy resources visible and tangible, which are otherwise hardly perceived in the electronic world. However, it also raises more questions than it actually answers.