Musicians are like professional athletes requiring warm ups, cool downs and being relaxed and ready to perform to prevent strain and injury. Hal Leonards Vocal Warm ups provide 25 warm-up techniques designed to take your voice out of the everyday routine and prepare the user for professional vocal procedures. These techniques start with broad, muscle relaxation techniques, breathing work and then develop into a warm up and strength of your vocal skills. The CD contains demos for listening and tracks you can sing along to.