if you go into your phones ringtones folder, do you see that rap song listed?
if so, go into your phone book and edit your friends phone number. There should also be an option in there to set the ringtone for that friend and that rap song should be listed. Just change it to a regular ringtone that you like.

My cellphone is set to a normal ring and that is what I always get. However, whenever my friend, who has a Boost Mobile phone, calls me, I get a strange ring. I hear rap music instead of my usual ringtone. How could this happen? The rap (ringtone) is very loud and embarrassing in public. Is there anything I can do about this?