How to download a ringtone for the iphone 5 that is of a song?

How do i download a ringtone for the iphone 5 that is of a song?

Buy a ringtone in the iTunes store and it will be downloaded directly onto the device. Otherwise, you could use the record feature on the device to set a ringtone. To "download" a ringtone, you would literally have to rip an audio file which doesn't turn out well with Apple's software.

You can't use a song as a ringtone, only a piece of a song. Why? Ringtones can't be more than 30 secs in length or the phone won't use them. Find a ringtone of the song you want. Best luck.