Méthode was our companion to Tony Cirone's Portraits In Rhythm, and Delecluse's place in percussion literature in France rather parallels Cirone's, in the US:
When Jacques started to write his etudes in 1964, there was almost nothing in the repertoire for snare drum in France: no methods, no books, no etudes, no solo pieces. Percussionists had to study from orchestral excerpts, military drum books, and a couple of low-level standard pieces. Delécluse did not merely revolutionize the pedagogical writing for percussion, he invented it! From nothing, he built a real school for percussion and created a pedagogical repertoire for snare drum, xylophone, timpani, and vibraphone. There is a good reason that most of these books are still in use today all around the world.
That's from Frederic Macarez's portrait of Delécluse on the PAS site. Macarez concludes:
Jacques Delécluse brought a new dimension to percussion playing: to consider dynamics, accents, phrases, and musical expression. In short, he makes us think about “how to make music with a drum.” This idea took root more than 40 years ago and is still applicable today. Jacques truly created a “school of percussion” and has deeply influenced generations of percussion players and teachers not only in France, but all over the world.