Piano Wire Smile was created in 2001.

The key of a piano connects to a system of levers which moves a small hammer that strikes a wire inside the piano. The wire will then vibrate and make a sound. That sound is then amplified by the wooden body of the piano, which resonates with the wire.

Yes. Piano wire is tempered high-carbon steel wire, but is not coated so appears dull gray. Music wire is tempered high-carbon steel wire coated and polished for use on stringed instruments (e.g. hammer dulcimer). However, music wire may also refer to the aforementioned piano wire. Their tensile strengths are identical.

Piano strings are made of steel wire.

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.