For solo alto saxophone, subtitled "Etude for the mastery of intervals of fourths, fifths, and octaves." This is the 38th concert étude by Christian Lauba, dedicated to Carl-Emmanuel Fisbach.

Musical score includes 5 pages of music. Extended techniques for saxophone included in this piece include multiphonics (fingerings included), slap-tonguing, and one altissimo G. Circular breathing is also an understood necessity. 

Currently available only as PDF download. Print editions will be available June 1.