My iphone won't let me manually add music?

For some reason everytime i try add music from different itunes it makes me delete everything.i've ticked 'maually add music' but still i have problems… Any idead?

Added (1). I drag the music over and it just won't copy.

You can't sync it to 2 different iTunes, otherwise it will delete everything everytime you sync it to one of those!

"i've ticked 'maually add music' "

and then what? Do you try to drag and drop the music from your iTunes to your iPod?

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