En clé de sol et fa mélangées avec accompagnement de piano-?tudes D'Intervalles - Dix-Huit Le?ons De Solf?ge?by Jeanine Rueff is a set of eighteen studies of intervals with Piano accompaniment. This theory book is written in G and F key.From seconds thirds to diminished sixths sevenths and to octavias these eighteen studies cover a wide range of intervals. It is a great book for musicians who wish to learn the necessary basics on the subject.Jeanine Rueff composed numerous pieces for Saxophones often used in contests as well as many pieces for Saxhorn Clarinet Horn and Cornet.