The Protomen, act I and II. It's a rock opera based on Megaman! It's also serious!
Act I is the main story, with the city under control of Dr Wily with his robot army keeping everyone in place, protoman being created to free the people and it's just full of awesomeness. It's also a full on rock musical.
Act II is much more diverse and is good in another way. The story focuses on how the city became in control of Wily, starting off with Light building the robots with him to replace miners, since his father died in them. Then like the city is made with the robots, and everyone has a nice time living under Wily and his robots, then events happen. In the end basically it goes to the start of Act I.
It's awesome, you should listen to it and if you do, make sure you look at the lyrics online so you can read the notes on the story (since some of them are instrumentals just for story)
Just awesome.... So awesome.