Scale Pattern Studies for Guitar

From the Preface:
Comprehensive scale study is basic to the mastery of all instruments.  There can be no question of its necessity for the guitar, simply as a means of acquiring an adequate knowledge of the fingerboard and a dependable technique.  Of no less importance is the intimate relation between exhaustive scale study and the development of the student’s native sensitivity and musicianship.  Finally, in all periods of music literature, from the Renaissance to the present, fluent, rapid performance of scale passages is a primary demand upon the performer.