Well the worlds need a theme before Grant and David can start composing the right music to fit, but I kind of hope we only hear a couple snippets before the release. The feeling when you enter a world for the first time and the music starts is amazing and I don't want it to be ruined by me knowing what's coming ahead of time.
To which you guys would probably say "THEN DON"T LISTEN TO IT!", but as soon as a new track is released I'm gonna listen to it on repeat. I don't have the willpower to resist.
EDIT:Grant not Grand, although Grant is quite grand