The Korg MS-20 is a semi-modular analog synthesizer first released in 1978. It features a distinctive design with a 37-key keyboard and a variety of knobs and patch points, allowing users to create a wide range of sounds. The MS-20 is known for its powerful filters and unique sound-shaping capabilities, making it a favorite among musicians and producers. This synthesizer includes two oscillators, an envelope generator, and a built-in sequencer. Its patch bay enables users to connect different modules in creative ways, enhancing its versatility. The Korg MS-20 has influenced many genres, from electronic to rock music, and remains popular in modern music production.