I came across this electone rendering accompanied by a violin and the overtones are just awesome. I am glued !

Some note on the wikipedia about the electone:
The Yamaha Electone series debuted in 1959 with the D-1, a home instrument. This was a bad moment to enter the market; as early “home entertainment centers,” electronic organs were facing heavy (and strengthening) competition from both television and high fidelity audio systems, neither of which required any musical skill, unlike the electronic organ. But by 1970, with the market waning sharply, and some manufacturers ceasing production, the Electone line, as did its competitors, embraced digital technology. This would be the key to the Electone’s survival as the traditional home electronic organ market dried up.

By the 1980s, many of the most famous names had ceased home production, but the Electone successfully translated into the modern world of digital synthesizers, now competing with such new electronic products as Moog Music, Wersi, and later Kurzweil. Electones were to be found not only in homes, especially in Japan and elsewhere in the East Asia, but also in bands and other solo and group public performances.