Add music to iPhone 4 without syncing?

So my iPhone 4 is jailbroken but the last time I synced it because I wanted to add new songs, it deleted all the other apps from Installous and its data too! Is there any way which I can just add songs and NOT sync it?

You can download a free program called MediaMonkey which you can choose which songs to put on or take off the iphone, no need to sync.

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