Dries Buytaert, the lead of the Drupal Project, noticed that the Rock Band web site is running on Drupal.

In the comments of the post someone who appears to be from Harmonix (the company that built the game) confirms it and notes that they are actively looking to hire Drupal developers.

He notes that they will even be using Drupal to connect to their game engine directly.

If you are a Drupal developer and this sounds like an interesting opportunity, check out the Harmonix jobs page for more information.