Voice therapy aims to rehabilitate patients to achieve optimal pitch, loudness, and quality while addressing voice and speech disorders through various methods, including hygienic, symptomatic, physiologic, and psychogenic approaches. Techniques like respiratory retraining, muscle tension reduction, and vocal functional exercises are utilized to improve vocal function and reduce laryngeal tension. The document outlines specific techniques such as circumlaryngeal massage, the yawn-sigh approach, and the Lee Silverman Voice Treatment to enhance therapy outcomes.