I wanted to announce that there is a strong possibility I may release mobiletunes v2.0 within the next week or so, compatible with all TI-83/+ and TI-84+ series calculators, as opposed to mobileTunes v1.0 which is only for the TI-83. The main MTUNES program itself is completed, and I am working on perfecting the associated song format for it. I hope to make this into a form that songs can be compiled for all calculators simultaneously, and I hope that people will create more songs when this is released. I am also creating an online converter, available in an early beta here to turn MIDIs into mobileTunes format. Enjoy!
Update: It is coming along swiftly, although I'm finding I need to optimize Doors CS 5 a bit more to make this work correctly. Doors CS 5.2 will probably be released around the same time as mobileTunes v2.0, incorporating any fixes that I make.