Rhythmicon (1930–1932)
In 1930–32, the innovative and hard-to-use Rhythmicon was developed by Léon Theremin at the request of Henry Cowell, who wanted an instrument which could play compositions with

While drum machines have been used much in popular music since the 1980s, "...scientific studies show there are certain aspects of human-created rhythm that machines cannot

• Electronic drum
• Groovebox  (generic groove machines)
• Music sequencer

• http://drum-machines-history.blogspot.co.uk
• https://musicriser.com/free-drum-sequencer/

Programming of drum machines varies from product to product. On most products, it can be done in real time: the user creates drum patterns by pressing the trigger pads as though a drum kit were being played; or using step-sequencing: the pattern is built up over

Drum machines developed out of a need to create drum beats when a drum kit was not available. Increasingly, drum machines and drum programming are used by major record labels to undercut the costly expense of studio drummers.