Recently, I've been playing a lot of The Beatles: Rock Band and a few things have bothered me. 1.) Why are there name difficulty ratings (i.e. Solid, Tricky, etc.) and out-of-6 "Band" difficulty ratings? What do these mean and how do they relate to each other? 2.) Is there a place to find how many points one needs to get Expert Gold Stars for each instrument/song combination? Any responses would be a great help.