In addition to being a composer, he appears to have been an innovator in notation of instrumental music:  in an instruction manual for the viol (1548, now lost), he is known to have produced the first viol tablature in France.
In addition to being a composer, he seems to have been a pioneer in notation of instrumental music:  in an instruction manual for the viol (1548, now lost), he is credited with creating the first French viol tablature.