I wasn't aware of this section of the forum, so I'll take the opportunity to point out this interesting little book:
CARL CZERNY, Letters to a young lady on the art of playing the piano.
This little great book by Carl Czerny is precious; everyone who has approached the study of the piano knows him as the author of the method that has made several generations of pianists, amateurs (in the noble sense of the term), and concert virtuosos sweat.
Well, these precious "letters" represent a wonderful integration to the study of the instrument, written by a solid connoisseur of the art of playing the piano and interpreting music.
Published in England in 1837, these Letters to a young lady, on the art of playing the pianoforte from the earliest Rudiments to the Highest State of Cultivation, are the practical expression of the teaching experience of a 46-year-old teacher musician who, in a fictional way, suggests some tips to a young English girl on how to make the most of her current teacher's lessons. The choice of the name Cecilia is not accidental, as Saint Cecilia is the patron saint of Music and Musicians.
Etc.