I've always thought about transcribing some of Aquaria's music for TI-83+. I've done it with one song (a tracker module, not Aquaria, obviously) by cutting parts to fit 4 channels. The pitch is way off, and it was either ridiculously slow or ridiculously fast out of the box. It would be a fun exercise if I had the time. And a link cable (I used to use a home-made serial cable, but my computer does not have serial ports). And a 2.5mm jack and some speakers (maybe).