66 Etudes in all major and minor Keys The Slama 66 Etudes have been used for over 90 years as a tried and true method for learning all of the major and minor keys on Bass Clef instruments. It is an excellent book for honing the basics of technique and gaining knowledge of all the scales. This new improved edition has been carefully edited by Ralph Sauer, eliminating many misprints and articulation conflicts. This method book is recommended for all students of intermediate level and above.