Music Systems is a company that produces electronic musical instruments for professionals and home users.
The company launched the K250 synthesizer/sampler in 1984: while limited by today's standards and quite expensive, it was considered to be the first really successful attempt to emulate the complex sound of a grand piano. This instrument was inspired by a bet between Ray Kurzweil and musician Stevie Wonder over whether a synthesizer could sound like a real piano. First issued as a very large and heavy keyboard, the electronics were also issued in a very large and heavy rackmount version, as the 250RMX (Rack Mount "Expander"—the presumed intention being that one could drive via MIDI and sequencers one or more "expanders"). Additional sample ROMS were developed and issued for both models.