Designer Yoshi Akai made this 3 channel, 8 step sequencer with Legos and steampunk styled metal hardware. Adding the Lego blocks makes sounds and beats. Different sounds are also created from different colored bricks. Naturally, as with all Legos, you'll want to build your structures taller. When you stack the blocks higher and higher, it makes the sounds more complex.

Not sure why he had Mickey Mouse do the demo.