A piano key is a small lever that, when pressed, produces a sound. The crossword solutions for the term 'piano key' are 'IVORY' (5 letters), 'NOTE' (4 letters), and 'SHARP' (5 letters). IVORY refers to the material used to make the keys of a piano, which are usually made of a hard, white material. NOTE refers to the sound produced when a key is pressed. SHARP is a musical term that refers to a NOTE that is higher in pitch than the original NOTE.