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Developing High Register on Tuba volumes 1 & 2 by Wesley Jacobs (now together in one book) provide the knowledge necessary for tubists to build and master the upper register.
The first part of this book focuses on building a foundation to support upper register expansion. Without a solid foundation in place, it is not possible to achieve the best results.
Use the second part of this book to expand range on both low and high tubas. This book progresses into the upper register of BBb, CC, Eb and F tubas. Detailed practice instructions are included.