All new Sprint phones will play standard MIDI files. Save them on your computer and upload them to the web using a site like www.pcspix.com. Once the files are uploaded to your PCSPix account, you can access them from the web using your phone.
I'm such a dork about my cell phone. I have specific ringers for each person. If someone is showing up that's not in my book, it plays No Surprises by Radiohead. Other ringers I use are Rapture, Atomic, Our House, Da Funk, Jenny 867-5309, Just Like Heaven, and Talk Show Host. I'm probably the one annyoing Nag in Pizza Hut or during an exam.
They should fill the thing with wisecracks for those who don't exactly follow the directions. I see you've decided to take your OWN route. Sure. Why am I even here?" I didn't tell you to take this exit. Do you have to go to the bathroom AGAIN?