Syncing my ipad with itunes

hi guys,

I have an ipod touch and an ipad 1.

I have itunes set up so that when I attach either the touch or ipad to the computer they sync with itunes.

On my ipad (32gb) I have all my music which I would like to delete. I assume that all I need to do is link it to my computer/double click itunes/open up the ipad menu/highlight all the music/hit delete !!!

but...what happens the next time I want to sync the ipad to itunes..won't it just add all the music again. Is there some way of 'telling' the ipad and the computer/itunes not to sync all my music.

thanks in advance.

mucky.