What is a person that very good at piano?

A person who is very good at playing the piano is called a pianist. A pianist is a musician who plays the piano, a keyboard instrument that produces sound by striking hammers against strings. Pianists use their hands and fingers to press the keys on the keyboard, which causes the hammers to strike the strings and produce sound. Pianists can play a wide variety of music, including classical music, jazz, and pop music. Some famous pianists include Ludwig van Beethoven, Frédéric Chopin, and George Gershwin.