HOW TO SAVE YOUR VOICE WHEN THE SHOW MUST GO ON: VOCAL THERAPY TIPS FOR SPEAKERS AND PERFORMERS  By Laura Kessler, M.M., CPC   The voice is a powerful, yet vulnerable instrument that deserves the same respect and consideration as the knees or spine.  The following are some simple guidelines and exercises I use with professional film actors, recording artists, public speakers and broadcasters faced with vocal hoarseness due to seasonal or lifestyle stressors.  They are ideal for hotel rooms, before special events, or can be practiced daily to maintain vocal health. Enjoy! ***  GOOD FOR VOCAL HEALTH:  Hum with your mouth closed (this sends vibrations down your esophagus…