How do Troy Clifford Dargin's certifications and special trainings contribute to his expertise in vocal performance?
Troy Clifford Dargin's certifications and special trainings, such as the Arthur Lessac Voice/Body technique and Vocology certificate, showcase his knowledge
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### Instruction:
How do Troy Clifford Dargin's certifications and special trainings contribute to his expertise in vocal performance?

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### Response:
Troy Clifford Dargin's certifications and special trainings, such as the Arthur Lessac Voice/Body technique and Vocology certificate, showcase his knowledge<|im_end|>