Several versions of "The Wizard of Oz" are performed annually. If you are not sure which version of the musical the theater is doing, call the theater office and ask. Research what songs are included in the musical version before you prepare your singing audition. Sheet music for most famous plays is available at music stores, including the music for Dorothy's "Somewhere Over the Rainbow." Work with a piano player to learn the music prior to the audition to give the best first impression of your singing skills possible. The director may have you sing with an accompanist at the audition or have you sing a song a capella, or without a piano.
The musical theater director will either have you read from the script or perform a monologue. If asked to perform a monologue, check the audition flyer for the monologue requirements. However, most monologues consist of a 2-minute prepared/memorized piece from a script that demonstrates your range as an actor. If reading from the script without much reading audition experience, practice by reading everything that you see -- signs, menus, ads -- out loud for at least 2-weeks prior to the audition. If you do this you will be more comfortable with a cold, or unprepared reading and find it easier to get through the script without hesitating. For characters, such as the munchkins, the wicked witch and Glenda, be sure that you concentrate on using a character voice as well.
Even the main characters dance in "The Wizard of Oz." Do not assume that you can get through the audition without dancing. The dance audition usually is accomplished after the singing auditions and consists of the choreographer showing one or more short dances to the perspective cast members. Those auditioning are given time to work with the choreographer in small groups for a brief period of time to go through the dance steps. They are given time to practice the dance before performing it before the choreographer for casting purposes. Pay close attention to the steps when working with the choreographer. Work the dance steps repeatedly until your audition time.
After the music, dance and basic acting auditions, the director, choreographer and musical director will begin to put people together to get an idea of what a potential "Wizard of Oz" cast might look like. To complete this process, most directors will ask those auditioning to read with one or more other people that are auditioning. If you make it to this stage of the auditions, this step is your chance to show that you are suited for a particular part. It also is where your practice on blind reading of signs and ads will come in handy. Only at this stage you will have to show emotion, the ability to work with other actors and that you are the next Dorothy, scarecrow or the wizard himself. Speak clearly, loudly and use a voice for the character that you believe suits the role. Listen closely to any direction that you are given and remain positive during the process.