Follow the to move that file into your ringtone library.
If you are looking for the most popular tracks to use as a ringtone, these are frequently cited as the most recognizable: College Fight Song Ringtones
Download an MP3 of the song (ensuring it is a legal, non-copyright-infringing recording). Follow the to move that file into your ringtone library
Since many songs aren't available for direct purchase, you can create a custom tone using audio files or screen recordings. : College Fight Song Ringtones