How to set a ring tone for my music on my iPhone?

Answer As soon as possible please I need to know

You can't set ringtones for music app on your iPhone

You can't use a whole song because ringtones have a time limit but what you can do is go into garageband put in the song you want to use, export as a ringtone where you'll get a pop up telling you to select the bit you want to use, select that bit, export as ringtone again it will show up in itunes in the ringtone category and when you plug in your phone you can import it to your phone to use it

and i just found this which explains it way better than i can
http://support.apple.com/.../kb/HT1358

Itunes

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