Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Powerful, provocative and masterful guide to your voice.

Jam-packed with powerful insights, Dr. Cooper teaches ambitious readers how to gain control of their voices and improve their chances of success. Recognizing the power of voice in the success equation, "Change Your Voice, Change Your Life" abundantly gives the "trade secrets" needed to transform ordinary voices into powerful megaphones of success. Rejecting the notion that voice is inborn and unchangeable, Dr. Cooper teaches interested readers the easy, straightforward steps to developing an influential voice. With extraordinary clarity, this book proves that voice is, in fact, one of the most overlooked but powerful ingredients of success. By following Dr. Cooper's lively, entertaining discussion, readers truly change their voices and indeed their lives.