there isn't really a least used key on a piano, but it does depend on which key you are playing in. example: c natural is played more than b sharp, even though they are really the same note.
or the least used key depending on what of music you like. example: if you like Blues Music you will play more in flat keys so sharps would be the least used so, there isn't really a least used key.
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The piano can play in any key because it is chromatic.
when you strike a piano key you get a musical note out of the piano.
There are keys in pianos.Similarly,a key is used to open locks.
The piano key is connected to a lever inside the piano, which transmits the pressure to a small hammer that strikes a stretched wire inside the piano, producing a note that is amplified by the wooden body of the piano.
piano has more keys