Hello. This may be an easy question, but.. I want to put a load of music on a DVD (in MP3 format) which i can do, but i want to be able to add to it later. When i try to make multisession disc with nero 6 i get message saying it might be unreadable (which it is). Is it because i'm using DVD-r? Do i need +r or RW or can't it be done? Cheers.