In this video, UK synth DIYer Sam Battle of Look Mum No Computer demos his Synth Bike 2.0 and explains the details of its construction.
Synth Bike 2.0 is a 1973 Raleigh Bicycles Chopper, with a drum machine/sampler/analog synth built into it in the front panel and top of the frame.
Tempo can be controlled by a built in clock tempo, or the front wheel, so the faster or slower you go the faster or slower the music goes.
Drums live inside a SparkFun Electronics, Inc. Wav Trigger. It has a total of 8 Arduino Nano’s in it. and a bit of Music From Outer Space LLC Echo Rocket to soften the edges.
via Sonic State