The current study aims to examine the effectiveness of central control in the recovery and growth of vocal competencies through efficient vocal training of musical actors. Musica l actors cannot be free from neck strain while they play musical songs that require a wide range of vocal ranges and intense vocals. Based on the theoretical support of the Alexander Technique's primary control that neck-head-body coordination is significant not only for breathing but also for the operation of efficient vocal organs, the dynamic principles were applied to vocalization and the effectiveness was assessed by interviewing 10 university students majoring in musicals and analyzing voiceprint. The results are as follows: Signifi cant changes when the central control was restored were experienced first, as the head came to mind, the pressed larynx, stuffy breathing, and the sense of length, width, and depth of the pressed torso were restored. Second, during voice scale, the movement of the larynx became smooth and expanded, and the vocal range expanded. Third, during Hands-On on the back of the neck, the clearness and resonance of the tone were improved, and the sense of vibrati on was strengthened with a higher effort in the head. In addition, the stability and vibrati on of the body were strengthened, and the stability of pitch and resonance was also experien ced. The results of the study suggest the effectiveness of the Alexander Technique in vocal training as well as proposing basic data for more advanced vocal training programs in the future.