UPDATE - 9/26@9:37AM: Thanks to the wonders of YouTube, a video of the portion of the show where Tom Sawyer is played is now available. Get it while it's hot.
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In tonight's season 2 premiere of NBC's post-apocalyptic television show Revolution, an acoustic version of Rush's Tom Sawyer is played. A few minutes into the show during a bar scene a musician in the bar plays a solo acoustic version of the song. It goes on for about 30 seconds, with some of it in the background. The episode should be available online later this week. Thanks to Gisabun and Wigtone for the heads up.