Special to The Aspen Times Kalonjee Gallimore catches big air in front of the cast of Theatre Aspen's "Rock of Ages" during a rehearsal for the 1980s jukebox musical. Timothy Bates Photography/Courtesy photo IF YOU GO … Where: Hurst Theatre, Rio Grande Park When: Through Aug. 21 Tickets: theatreaspen.org Jukebox musicals such as “Rock of Ages,” now running at Theatre Aspen through Aug. 21, rely heavily on audience participation for their success. Character, plot and intricate lyrical score — the fulcrum around which the traditional musical turns — is simply not the point. Nostalgia, rather, is. The audience’s collective memory of a different time and place, a youthful, often more innocent-seeming period is the glue that holds the jukebox musical together. Familiarity trumps originality every time.