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  They can also help prevent you from hurting yourself in the long run if you’re singing a lot.
context: It's a vocal coaches job to impart you with technical ability, not necessarily with artistry. It's great to sing with emotion, but when the focus is on learning technique it can be beneficial to take that aspect out of it, as it can compensate for improper technique. You can always put it back in once you are comfortable with actually being able to sing.