RB3 Setlist Question

[vengeance96]

So I just got RB3 and I have a few questions.

There are songs that should be in the game but I can't find then anywhere in the game or in the store, will they be unlocked later or something?

How do I play songs "for real" without practice mode? And I don't mean the roadtrip mode.

And is there any way to get.. Say Green Day songs (that it says in the booklet are included) without buying them? Or other songs for that matter.

And there's only a few songs included in-game and in the store by my fav band. Is that because they're maybe not common enough to be included in the game?