RECOMMENDED The most thrilling number, among many, in this joyful production may be the Act I ensemble anthem that might be called “Why Don’t You Feel Alright for the Rest of Your Life?” It’s actually a song-within-the-song “Jason’s Therapy,” in which the show’s adults offer a lesson to young Jason—and themselves—during a therapy session. The song sets the exuberant tone for the show and grows into a leitmotif, that holds the characters and this electrifying production aloft.