Mick Berry, MFA, is the coauthor of The Bassist's Bible and The Drummer's Bible and has been a performing musician for more than 35 years. He has toured the United States, Canada, and Mexico, and has performed with Henry Butler, Eddie Henderson, Michael Wolff, and E. C. Scott. Michael Edelstein, PhD, has been a practicing psychologist for four decades in New York City and San Francisco. He is a fellow of the Albert Ellis Institute and is the author of the popular self-help book Three Minute Therapy. They both live in San Francisco.