The reason why the Central Conservatory of Music only reaches Grade 9 is that the Grade 9 of the Central Conservatory of Music is the highest level of music proficiency outside of the Central Conservatory of Music. According to the query of relevant information, there is no performance level in the Central Conservatory of Music examination, and level 9 is equivalent to piano level 10 of the Musicians Association. The piano is a keyboard instrument in Western classical music. It consists of 88 keys and a metal string soundboard. The Italian Cristofori invented the piano in 1709.