# Piano is both a string instrument and a percussion instrument Under a piano's lid, when a key is pressed, a hammer felt strikes a string to make the sound. The vibration of the string is responsible for the sound, so a piano is a string instrument. The sound is also indirectly made by striking, thus piano can be counted as a percussion instrument as well. Similar instruments including hammered dulcimer and using the _col legno_ technique on bowed string instruments like violins. ![[Piano hammer string mechanism.mp4]] _Animation of how a piano key produces sound._ ## Road signs - [[Piano]]