Leonardo da Vinci designed the viola organista to produce continuous bowed musical notes.
The viola organista combines ideas from a keyboard instrument and bowed string instruments. Pressing keys would select strings, while rotating wheels or a moving bowing mechanism would create friction against them. This arrangement aimed to let one player produce sustained, expressive tones with keyboard control.
Leonardo developed several versions of the concept in notebooks from the late fifteenth and early sixteenth centuries. He did not leave a confirmed surviving instrument, and no evidence shows that his design became a standard working musical device during his lifetime. Modern builders have constructed playable reconstructions based on his drawings.
The instrument’s name reflects its hybrid character: “viola” points to bowed strings, while “organista” suggests a keyboard-operated mechanism. It should not be confused with a conventional organ or a normal viola. The design demonstrates Leonardo’s interest in applying mechanical motion to artistic performance.