How to transfer individual songs from itunes to iphone?

Whenever I try to transfer individual songs from iTunes to my iphone 4s it won't let me.
I have to sync the entire library and erase what is already on there.
I got a new laptop recently so I don't know if it's because its registered to 2 devices or not but please help!

If i'm right it works the same as for ipod you sync tt see the library just drag and drop if your having any trouble try to put the cable in and out a couple of times or restart your laptop or better reinstall itunes.

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