My phone already plays just about anything I USB into it. I have various convert programs on my PC that will do this job. Most of them are freebies. I use my phone as a mp3,midi file,video and wav player sometimes to practice new songs. Its a good idea.
But some people have the most irritating and crappy ringtones.
Examples are The Crazy Frog, farting, Some guy shouting answer the phone,an electric razor,the can can,Led Zeppelin,The Nokia tune. Some people (very few) actually use a proper ring ring....Shucks what is the world coming to.
I dont know what my ringtone is as no one ever phones me they just send texts.
Do people actually make phone calls nowadays?