User:Popcornfud/drum machine

In 1931, engineer Léon Theremin and musical theorist Henry Cowell created the Rhythmicon, also known as the the Polyrhythmophone, which generated rhythms from This bizarre conglomeration of valves and radio-based technology used the principles of the harmonic series to generate rhythms in response to the user holding down one or more of the contraption’s 17 keys.

In 1972, Kakehashi formed the Roland Corporation, and hired Lewis to help design drum machines. By the late 1970s, microprocessors were appearing in instruments such as the Roland MC-8 Microcomposer, and Kakehashi realized they could be used to program drum machines. In 1978, Roland released the CompuRhythm CR-78, the first drum machine with which users could write, save, and replay their own patterns.

https://www.factmag.com/2016/09/22/the-14-drum-machines-that-shaped-modern-music/

https://mixdownmag.com.au/features/columns/musicology-the-history-of-the-drum-machine/

https://www.musictech.net/guides/essential-guide/drum-machines-history/

https://www.smithsonianmag.com/arts-culture/history-tr-808-drum-machine-180975205/