Merry Christmas and Happy Holidays!
We generated the gcode for this using michthom / MIDI-to-CNC. It was great fun to play with.
You can also download the gcode file we used for this video (it's not likely to work well with other printers). Take your z stage all the way to the top, and roughly center your x and y axes. If you want to try playing music on a different printer, download Midi to CNC above and give it a shot!