this is an interesting thread, i cant say im a fan of the music you posted (the positive lyrics are good-but if you want a thread taken seriously as you said you might not want to post ZZ Top videos-just a suggestion....) i also dont subsrcribe to calling good/negative entities angels/saints or demons.
i consider myself "good" but its all relative. a deer is neutral towards a bird but views a wolf as bad, and im sure the plant that the deer could eat would view the wolf as a savior or "good"
yin/yang existence needs creation and destruction - we need good and bad. its how we evolve physically and spiritually.
hopefully the negative thats been dominant in human history is about turn positive after a lot of friction.
elemental particles become more and more chaotic before they transform, say from a liquid to a gas and just before transformation they reach a maximum chaos point- i believe thats what the last hundred or so years has been and the next few promise to be even more intense.
thats my (human) 2 cents into the mix
heres a sad video
http://www.youtube.com/watch?v=8EXC6Ix3C0I
-k