1. This is a top-down comparison of the entire keyboard and staff (from the bass clef to the treble clef) of an 88-key (52 white keys + 36 black keys) piano (the keyboard is divided into 7 multiple groups). At the top of the legend are the division marks for the three sound zones: high, middle and low.

Information expansion:

The piano is a keyboard instrument in Western classical music and is known as the "King of Instruments". It consists of 88 keys (52 white keys, 36 black keys) and a metal string soundboard. Italian Bartolomeo Cristofori invented the piano in 1709.

Source: Baidu Encyclopedia Piano