How to put mp3 songs from my computer onto my iphone 4s?

The trouble is these songs arent from itunes, so i can't "sync" itunes with it, is there a way?

Drag-and-drop mp3 files from any folder into the iTunes library or playlists.

Go to your library in iTunes.
drag-and-drop your songs to the list of songs you have.
I personally don't sync my songs to one computer only so I can get my songs from other computers.
to do What I do. You must select manually sync music.
after you do that You just drag individual songs or playlists to your iPhone 4s device then you should see on your phone Sync in progress this indicates that the songs you selected are now being copied to the iDevice

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