I see where you're coming from. It's close, and I even struggled deciding which would be MC. But ultimately I rate difficulties on reproducing the song, not necessarily how hard it is to make good number in Rocksmith accuracy, and in my opinion making God Knows' rhythm guitar sound like the song is remarkably harder than making Future People's, even though it's certainly easier to score higher on.. Though both charts are good, they are also not perfect - neither rhythm includes the dynamics, which are a big factor in nailing both songs but harder to pull off in God Knows. I'm gonna leave class selections as they are.