[youtube=http://www.youtube.com/watch?v=qt1fOED0vC8]
Poke around and you’ll find all sorts of semi-workable music instruments out there for Minecraft, but this one — of two stacked key-beds — is interesting because it’s both programmable and animated, offering two sounds — piano on top, bass on bottom — and letting you store up to 12 measures on each “piano roll.” (Alternatively, check out the authors’ programmable drum kit, playable guitar and 8-track music sequencer.)