There is a lost(?) work attributed to
Flamel by Borel entitled "La Musique chimique".
Schneider, in his 'System einer medizinischen Musik', Carl Georgi 1835, vol. II, page 200, fn 71, refers to it as being published in Paris in 1459 [sic] which, if correct, would make it the earliest book printed in France by more than 10 years. Bosc (Bibliographie générale des sciences occultes, p. 35) also refers to it as if he had actually seen it, while Collin de Plancy describes it as an 'opuscule très-rare' (
https://fr.wikisource.org/wiki/Dictionna...863/Flamel ).
I assume that the book, if it ever existed, discussed the healing powers of music.