Berklee In The Pocket: Singer's Handbook - A Total Vocal Workout in one hour or less! An indispensible, handy guide that sets a perfect 45- to 60-minute practice routine for you. Use it as your practice guide for a total vocal workout, from warming up to cooling down. Breathing Exercises; Tips for Productive Practice; Mental Practicing; Breathing for Relaxation; Cool down. Use Singer's Handbook to learn new tunes, strengthen your voice, extend your breath support, clarify diction, & fine-tune.