Interesting to me for the bits they discovered in well-known songs' master tracks:

Even a seminal punk band like the Clash yielded some surprises. Even wonder why the drums sound so good on “I Fought the Law”? Because there’s two drummers on it (or more likely, drummer Topper Headon recorded his part twice)—something that became clear when Brosius picked the mix apart. Thus, the drum parts you play in Rock band are a composite of those two original drum tracks. The Spanish backup vocals that you’re used to hearing on the middle verse of “Should I Stay Or Should I Go” originally ran through the whole song; and the parts are still there on the tapes—You can hear a little more of the Spanish bits on Rock Band than you can on the record