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3. Amedeo D. How to pick song materials for musical theater auditions. Available at: https://www.backstage.com/magazine/article/pick-song-material-musical-theater-auditions-4203/. Accessed March 17, 2022
4. Vocal qualities in music theater voice: perceptions of expert pedagogues;Bourne;Jvoice,2016
5. The Science of the Singing Voice;Sundberg,1987