Okay, let's try something. I will list off all of the music from Sonic Generations in order of personal preference. I will update whenever I have the time to.
At number 6, we have the Green Hill Zone music! Really, it's the same music from the original Sonic 1 with an added techno beat, but come on, the Green Hill Zone music is really catchy anyways.
At number 5, we have the Sky Sanctuary music! Really, it's just like the Green Hill Zone remix, but it still has that sense of wonder and awe the original had.
At number 4, we have the Chemical Plant Zone music. Again, look back at the other 2 remixes from the Classic Era for my general opinion, but something about this piece sticks out to me.