The SH-101 is a very simple monophonic synthesizer manufactured by Roland from 1982 to 1985. Even though it never really succeeded commercially, it still became quite legendary in the realms of (early) electronic dance music, mostly in the 1990s. 

It features one oscillator (plus a sub-oscillator), two waveforms: pulse & saw, a noise oscillator, a simple sequencer and a fantastic sounding 24dB/octave resonant low-pass filter, that can be driven into self-oscillation and can be set to key tracking, to harmonize with the oscillator. 

The SH-101 was marketed to the emerging “Keytar”-market, with the option to attach both a hand-grip with modulation control and a shoulder-strap, as well as powering the synth by battery. The synth has been famously used by Nitzer Ebb, The Prodigy, Orbital, Aphex Twin, Tangerine Dream, Depeche Mode, Squarepusher and many many more.