MSSIAH - MIDI SID Software
http://www.8bitventures.com/mssiah
"The MSSIAH is a MIDI cartridge for the Commodore 64.
It contains a suite of music applications that starts instantly as you insert the cartridge and start up the computer.
With these applications you can play the C64's audio circuit (SID) via MIDI or stand-alone with the internal sequencers."
The Pythagorean Lambdoma Harmonic Keyboard May Reveal Key to the Universe » Synthtopia
http://www.synthtopia.com/content/2010/01/10/the-pythagorean-lambdoma-harmonic-keyboard-may-reveal-key-to-the-universe
"The Pythagorean Lambdoma Harmonic Keyboard, designed by mathemetician Barbara Hero, is an unusual MIDI controller that’s based on ancient concepts and fundamental harmonic relationships between notes.
The keyboard is based on the Lambdoma Matrix, a mathematical grid attributed to the philosopher Pythagoras. The Matrix plots whole-number ratios, with whole numbers along on side (1,2,3,4….) and their inverse fractions (1/1, 1/2, 1/3, 1/4….) along the other."
Play Rhythm Games using any MIDI Instrument
http://egyokeo.com/midihero
"wouldn't it be great to be able to play Guitar Hero on the drums?"
Create Digital Music » Gorgeous DIY MIDIBox64, MIDI Controller for Live, Traktor, Max
http://createdigitalmusic.com/2008/05/13/gorgeous-diy-midibox64-midi-controller-for-live-traktor-max
"It consists of 16 knobs, 5 faders, 16 arcade buttons, and 32 MIDI controlled LED buttons. "
subatomicglue - MidiboxSID work log
http://www.subatomicglue.com/sidl0g
"This is the worklog for my MidiboxSID, a synthesizer that has sound chips from the original commodore 64 personal computer from the 1980's. These sound chips are called the SID 6582"
Master Gaita in English - Bag Pipe style MIDI controller
http://www.arrakis.es/~jpresedo/midig/mgengl.html
"Far from being a simple practice chanter, Master Gaita ® is a simple but powerful tool that lets to use the bagpipe fingering to get into and control the MIDI universe, and also to open new ways faced to the learning of bagpipe technique and music."