(Berklee Methods). The Berklee in the Pocket Singer's Handbook is a must-have guide that sets a perfect 45- to 60-minute practice routine for you. Use it as your practice manual for a total vocal workout, from warm up to cool down. Covers: breathing exercises, tips for productive practice, mental practicing, breathing for relaxation, cool down techniques and more. Learn new tunes, clarify diction, and improve all aspects of your singing!