Just got to tier 7, the japanese live place, finally got to play Knights of Cydonia, but my fingers are finally getting tired and the red fret is starting to stick.
There were a couple songs along the way that got me some 3 stars, so I'm pretty happy. Those guitar battles are a joke though, restart until the first power up you get is the whammy bar thing then just unload it on the CPU at a solo.