[quote name='jonlubbe']I thought you could delete songs from rock band 3. (I believe i did it with one of the terrible rush covers)[/QUOTE]
You can delete songs as long as they aren't part of a larger pack. So, if you downloaded the Rush songs separately and not as one of their slightly discounted packs, you can pick and choose what you want in. Same with RB1 stuff, those songs are each listed separately, as opposed to Rock Band 2, where everything is in one massive pack.