How to drag and drop music onto iPhone?

So I attached my iPhone into my computer and I would like to drag and drop music from this computer into the iPhone. I have done this action before, but on a DIFFERENT computer. I know that you are supposed to select the "manually manage music and videos" option, but then it asks if I would like to "erase this iPhone and sync with this iTunes Library." I do not want to loose my music just to add a few songs from this computer onto my phone. Is there any way possible to fix and allow me to drag-and-drop from this computer?

Nope. You can only do a complete sync.
When you've done it before, your phone already found your current apps an music on your computer and just added the changes.
You can only do what you want if you jailbreak.

Ask! The key in this situation is to maintain an open, polite and honest line of communication. Express how you feel. Be yourself, but, remember, do it respectfully! Hope this helps!

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