"Inner Universe": Also from Stand Alone Complex. Epically awesome track that fits both in-universe and as a soundtrack. The lyrics (subbed into the AMV) are also quite significant to Shadowrunners... which, of course, makes all sorts of sense.
"Lithium Flower": Again with SAC. Really,
anything from Ghost in the Shell or its sequels/spinoffs is going to be perfect, since the only significant style difference between Shadowrun and GitS is lack of magic.
"Bad Company": The 5-Finger Death Punch version. The extra level of aggro in the arrangement, compared to the original, really sells it for me. Plus, c'mon, you can't tell me a line like "
Chose a gun and threw away the sun" doesn't tie in with
Shadowrun.
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Dubstep in general fits great with the theme of the Sixth World, but here's a trio of tracks by Skrillex that have videos that "illustrate" the music in ways I think are particularly appropriate for the theme:
"Bangarang": Some street kids jacking an Icecream Man and then graduating to jacking what look like bank-robbers. End of the video, one of the kids gives a briefcase (presumably full of money) to the Icecream Man from the first sequence.
"First of the Year (Equinox)": Pedophile follows a cute little girl down into a basement. Turns out she's either possessed or something like a Free Spirit. Needless to say, it doesn't end well for him.
"Ruffneck - Full Flex": A burnt-out, pill-popping Santa Claus dealing with a bunch of screaming kids, then getting chased by (and beating down) a posse of thugish security guards. I could easily buy it as a Street Sam or Adept that Ran for too long without making The Big Score, but still has a few doses of Badass left in him.