Green Day's "Good Riddance (Time of Your Life)" is performed by the entire cast, all of them playing guitars. The offer is billed by producers as a special thank-you for seeing the rock musical that reinvents the Green Day punk album. Simply type in the date of the performance you attended, and the song appears (and you might even hear yourself screaming your approval). This offer is of particular interest the week of Sept. 28-Oct. 3, when Green Day frontman Billie Joe Armstrong is playing the role of St. Jimmy. Check out the download offer here.
In a similar vein, the producers of the recent Broadway production of Hair videotaped the audience-populated after-show dance party at every performance and put it on that show's official website, offering fans a chance to see themselves dancing on Broadway.