French saxophonist, Jean-Marie Londeix (b. 1932) graduated from the Paris Conservatoire with a First Prize and a Prize of Honour. As a fantastic all-around musician, he has a vast experience which makes his study books, including On the Exactness of Intonation for all Saxophones, very well-informed.

His career has taken him all over the world and many composers have written works specially for him. As an accomplished teacher of other famous saxophonists, he has deduced where the gaps in studies for the instrument are, composing six significant books of the kind. Londeix's On the Exactness of Intonation addresses intonation within the context of intervals of octaves, fifths, fourths and major and minor thirds. For all aspiring saxophonists, On the Exactness of Intonation, compiled by renowned, contemporary saxophonist Jean-Marie Londeix, is an essential guide and aid to progression of intonation on the instrument.