"No," you say, "a typewriter is not an instrument." Well Erik Satie would tend to disagree. The typewriter is featured as a percussion instrument in his music for the 1916 ballet Parade, and it has been composed for on numerous occasions since. I performed Parade with SMU's Syzygy ensemble in 2017 under the direction of Hannah Threlkeld. The dance aspect of the ballet was performed by the Dallas Neoclassical Ballet; you can see the whole thing in the video below (the typewriter comes in around 8:50).