Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The definitive book on the subject

Psychiatrist and researcher Julie Holland M.D. has done a great job assembling this collection of essays on MDMA. With contributions from Andrew Weil, Ralph Metzner, Zalman Schacter, Rick Doblin, Douglas Rushkoff and many others, the book very honestly analyzes Ecstasy from many viewpoints: medical, psychotherapeutic, public health, criminal, social, and historical.Holland and her contributors have created the best book on Ecstasy in print...it is destined to be considered a classic.