Whys that, thats kinda stupid. Do I have to download the ring tone from my provider?

I wanted an Instrumental song, all the songs they have the the retail ones.

Hello Everyone.

I got a Motorola KRZR k1m and im trying to change the ringtone to an MP3. Ive put the MP3 on my phone but it doesnt let me change it to the song. The song is under the Audio Sounds on the phone but its not under the MP3 Player either. Also is it possible for me to delete all the sample music and pictures they gave me?