I watched Threepenny Opera on Youtube today, and it's really an amazing production. I don't feel like going into an in-depth synopsis...
Well, it was written in Berlin as the Nazi power was coming into power, as a protest against them (presumably), though it's set in Soho, London.
There is a lot of anti-capitalism in a Marxist sense, and generally is a dark comedy. It's amazing...
http://www.youtube.com/watch?v=R9sMDmf0wyI