Summer Music Theatre vocal auditions. Vocal auditions for the North Central College Summer Music Theatre productions of "Seussical" and "Oklahoma". Prepare 16 bars of a song that shows off your voice. Musical theatre pieces are preferred. Bring music in the key that you sing. An accompanist will be provided. You only need to audition if you are interested in sing part in either show. If you are just interested in the chorus, please simply sign up with the office of Conference Services.