The Essential Elements String with EEI: A Comprehensive String Method, Cello Book 2 (0634052675) is an instructional book designed for cello players. It is part of the Essential Elements for Strings series and is authored by Michael Allen, Pamela Tellejohn Hayes, and Robert Gillespie. This book is suitable for players at the Book 2 level and provides a comprehensive approach to learning and mastering the cello. With its detailed instructions and exercises, this book is an essential resource for cello players looking to improve their skills and technique. ISBN: 0634052675.