Casio MT-40

It wasn’t based on any other tune.”[5] According to Okuda, there was some talk at the Casio corporation of attempting to defend their intellectual property from its free use in "Under Me Sleng Teng" with lawsuits.

Toshio Kashio in particular felt strongly that the company's mission ought to be “bringing the pleasure of playing a musical instrument to everyone.”[8][9] Despite the minute size and financial importance of the Musical Instrument division compared to the company's calculator division, then its main breadwinner, Toshio Kashio's defence of free use set a decisive corporate precedent.

[2] The MT-40 has also secured a niche in indie music, frequently used by the Magnetic Fields, and featured on most of Emperor X's album Tectonic Membrane/Thin Strip on an Edgeless Platform.

Its thin fuzz can be heard on lesser known Australian indie band Turnstyle's top 20 single "Spray Water on the Stereo".

California-based indie rock group Picture Atlantic used a mixture of the MT-40's organ sound and bass notes for their tracks "Circe", "Anytime/Coats of Armor", and "....That's Just Me" on their album Kleos.

[10] San Francisco indie rock duo Casy and Brian exclusively used the Casio MT-40 for three of their four releases, altering its sound with effects such as overdrive pedals to accompany drums.

[11] Former Boston/San Francisco street musician The Space Lady plays the MT-40 through a Small Stone phase shifter to create an ethereal tone to accompany her delay-enhanced vocals.

Damon Albarn of Gorillaz used an MT-40 to construct the demo and live versions of the second single from the band's 2017 album Humanz, the track "We Got the Power".