If there is ever one song that you should not listen under the influence of hallucinogens or other mind-altering substances, it would be "Pizza Song," quite possibly one of the creepiest-sounding tracks in existence.
io9 decided that Firefly needed a "tight-ass killer 1980s intro." So they cut one together: the article, or just the intro itself. A fan's end-credits, even with a nice slight soupçon of MTM at the end. Firefly fans might find it more interesting, though, that io9 noted a little later in the day that Nathan Fillion had tweeted on Wednesday night a picture of Joss Whedon, Alan Tudyk, Nathan Fillion, and Adam Baldwin all looking upward into a bright light, with the text "Together. Again." But ... no, it doesn't mean that, unfortunately. [Still, if you need your Simon or Kaylee fix, look to Warehouse 13 next Tuesday, as Maher and Staite are guest-starring together in "Mild-Mannered" (trailer).]
"Don't Download This Song." A free, and rather hilarious, download from "Weird Al" Yankovic done in the 'charity gospel' "We are the World" style, including a few gems in the lyrics like "even Lars Ulrich knows it's wrong." Direct MP3 link. Music video evidently coming shortly.