If you can solder and have a basic understanding of electronics, you can add MIDI output to your DS, DS Lite, Game Boy Advance, or GBA SP. The Midify chip also interfaces with other electronics -- apparently anything that has some kind of user input. For just $35, this chip adds a MIDI port to the DS.
It doesn't turn the DS into a MIDI sequencer or allow you to output MIDI, rather, it adds a MIDI in port to the DS, allowing you to control the DS via keyboard. Confused? Imagine the DS is the microwave seen here -- it has been fitted with the Midify chip.
[Via hackaday]
This demo for a new application, DSMidiWiFi, just looks incredible. Though the program is still in early stages, the potential for music creation is vast. DSMidiWiFi turns any DS into a wireless MIDI controller that can interact seamlessly with a computer or other DS units running the application. So take a few musically-inclined souls, arm them with a DS, and voila! DS MIDI band. Now we just need to get some people together to reproduce some 
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