BEATLES DEEPER UNDERCOVER IS THE GREATLY UPDATED 2010 VERSION OF THE 1998 BOOK BEATLES UNDERCOVER. HERE ARE SOME REVIEWS ABOUT KRISTOFER ENGELHARDT'S BOOK BEATLES UNDERCOVER:
GOLDMINE MAGAZINE (US): This outstanding book is simply the most exhaustive body of work to date to document the known contributions made by The Beatles (as a group and individually) to the recordings of other musical artists. Beatles Undercover is a tremendously valuable contribution to The Beatles litarary canon, and deserves to be added to the library shelf of every serious fan of the group. Rock music fans in general will discover what a wealth of musical and historical gems contained within these pages.
RECORD COLLECTOR MAGAZINE (UK): Engelhardt's discographical details is remarkable, making this a must-buy book for any serious Beatles collector. One of the five best rock books of 1998.
ROY CICALA (John Lennon's recording engineer): This book stands alone as the last word on The Beatles' work for other artists. The research and attention to detail are astounding.
FORMBY TIMES (Liverpool, UK): This is a monumental, scholarly work and will appeal to those who want to follow the development of The Beatles as individual artists. It is highly professional and will, in my view, become recognized as the standard work in this field.
Q MAGAZINE (UK): Tirelessly catalogued, exhaustingly comprehensive, three stars.
BEATLEFAN MAGAZINE (US): Beatles Undercover seems unlikely to be surpassed.
BEATLOLOGY MAGAZINE (CANADA): Painstakingly researched, thoroughly documented, and entertaining to read, Engelhardt's Beatles Undercover is a reference book that any Beatles completist will want to have.
DISCOVERIES MAGAZINE: It's usually possible to find one or two inaccurate statements in a Beatles book, but I didn't notice any in Beatles Undercover. Engelhardt gets it right. Such dilligence is typical of this book, which seems to be the definitive look at the Fabs' extracurricular work.
JEFF LYNNE: Kristofer, Well done, the book is amazing!
GEORGE HARRISON: K. What a book! A massive job.

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