Specialising in teaching music, Denis Le Touzé currently researches the tonal system and notation of classical music. Therefore, his Writing Music in 30 Lessons is very well-informed.

Le Touzé's Writing Music in 30 Lessons is divided into two volumes. The first volume incorporates three types of exercises; technical exercises for the understanding of chords, figured bass, and composing melodies. Compiled in 1996, Writing Music in 30 Lessons is very up to date, ensuring that the exercises are relevant and clear. For all aspiring musicians seeking to improve their written notation of music, Le Touzé's Writing Music in 30 Lessons will ensure successful progression.