What level is the son of the weather piano?

9- 10. According to the query of "Son of Weather", the piano repertoire is divided into ten grades, and "Son of Weather" belongs to the piano repertoire of 9- 10 grade. Piano is a keyboard instrument in western classical music and has the reputation of "the king of musical instruments". Its predecessor is plucked clavichord, which consists of 88 keys (52 white keys and 36 black keys) and a metal fretboard. Italian Barto Romeo Christofi invented the piano in 1709.