Why's it part of the "Rock Box" playlist?: It's featured in Community's pilot episode. I wonder if the choice of "Good Ol' Fashion Nightmare" is a swipe at the pants Joel McHale is wearing all through the pilot (see above). If so, that's awesome.
Which moment in the Community pilot does it appear?: The scene when Jeff (McHale) tries to ditch the study group--a rambunctious bunch of folks he'll grow to tolerate over the course of the season--and is caught by Britta (Gillian Jacobs) while she's having a smoke break. The song also turns up when Jeff takes the Spanish test answers out of the envelope Professor Duncan (John Oliver) gave him and discovers his friend tricked him and slipped him nothing but blank paper.
My favorite non-cable show Community is back tonight with its first new episode since the ambitious stop-motion-animated Christmas ep, so here's "Good Ol' Fashion Nightmare," which was also featured in the trailers and promos for the pilot before it premiered.