haha that was one of my favorite parts of that movie!
To be honest i'm not playing around with it that much. I tried real quick after figuring out how to add an mp3 as a ring tone (most intuitive thing ever*) but when it didn't work the same way i gave up. Perhaps i'll try uploading a MIDI file onto the phone and see if that works.
*go to your MUSIC app, touch/hold a song, set as ring tone. Boom, you're done. Not only does it set it as your default ringtone, it pops up on your list of ring tones, which is handy for setting individual custom ringers.
Right now i have an 8-bit version of a +44 song that i found on youtube and converted to MP3. If anyones interested, you can find it
here. Even if you're not a fan of the band (or dont know who they are) but are a fan of chip tunes, its worth a listen. I play mega man 9 with this on sometimes and it fits perfectly!