Why does the piano have its shape?

Why does the piano have its familiar curved shape? 

The piano is actually a stringed instrument so when you hit a key on the piano keyboard it sets a hammer in motion and the hammer strikes a string.  The string then vibrates and transfers its vibration energy to the sound board and the sound board radiates to the room.  The piano has 88 keys and each key produces a different pitch.  …

Chopin Nocturne Op. 62 N. 2 Autograph Manuscript

Chopin Nocturne Op. 62 N. 1 Autograph Manuscript

Chopin Nocturne Op. 55 N. 2 Autograph Manuscript

Chopin Nocturne Op. 55 N. 1 Autograph Manuscript