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RMI Electra-piano and Rock-Si-Chord (600-Series)

RMI Electra-piano and Rock-Si-Chord (600-Series)

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Page last updated Aug 11, 2025

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Description

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The 600-series RMI Electra-piano combined the sounds and features of the previously successful Rock-Si-Chord with that of the Electra-piano.

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about RMI Electra-piano and Rock-Si-Chord (600-Series).

Features and functionality

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Each note on the RMI Electra Piano has its own oscillating circuit, contributing to its unique "buzzy" sound.
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The RMI Electra Piano lacks velocity sensitivity, presenting more as a "transistor harpsichord" than a dynamic electric piano.
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Use cases and applications

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The distinctive sound of the RMI Electra was prominently used in Genesis's "The Lamb Lies Down on Broadway" album, suggesting a fit for progressive rock.
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Comparisons

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The RMI Electra Piano was eventually overshadowed by models like the Moog, Yamaha CP70, and Korg, indicating its limitations in evolving music technology.
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Critic Reviews

RMI Keyboards [Retrozone]

soundonsound.com

The RMI Electra-piano and Rock-Si-Chord shine with a unique character that defined much of the '70s progressive rock scene, offering a range of quirky sounds that can evoke nostalgia. Its distinctive organ mode and the ability to layer voices like no other make it a standout. However, its lack of touch sensitivity and a limited 68-note keyboard can be restrictive, especially for those used to more dynamic instruments. While the sound quality is charmingly vintage, it might not suit modern performance needs. An iconic piece of gear for collectors and retro enthusiasts, but perhaps not the best choice for today's stage.

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Simon House

Keyboardist, Violinist

Hawkwind

Verified via Photo

As seen in this photo, Simon played an RMI Electra Piano during his years with Hawkwind.

Lonnie Jordan

Keyboardist

War

Verified via Photo

In this photo, Lonnie Jordan can be seen with a 600-series RMI Electra-piano and Rock-Si-Chord during a performance with Eric Burdon and War on March 21, 1971 at the Depot.