How to sync new music when the iPhone is not synced to the computer?

I'm trying to put music on a friend's iPhone and her phone isn't synced to my computer, so its not letting me put the music on.

Don't do it, if you Sync it, It will put All of your iTunes info, such as: Contacts, Pics, etc. On her iPhone. She's going to have to find her own music. It don't work like that.

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