Keith Emerson

States that Keith used the piano in his live setup

Sound on Sound lists Keith's gear in this article, which includes a Hohner Clavinet D6 Classic keyboard with real strings.

This Sound On Sound article states: "The huge cost of the Fairlight CMI did not put the rich and famous off. Peter Vogel brought an early CMI to the UK in person, and one of the first people to get one was Peter Gabriel. Once UK distributor Syco Systems had been set up, the client list started to grow. John Paul Jones (Led Zeppelin) bought the first as a replacement for his Mellotron. He was soon followed by Kate Bush, Thomas Dolby, Geoff Downes, Queen, Keith Emerson, Alan Parsons, Stuart Copeland, JJ of Art of Noise, Trevor Horn and Frankie Goes To Hollywood, and many others."

This Sound On Sound article states that Emerson owned a Polymoog.

This Sound On Sound article states that Emerson used a Yamaha GX-1.

This Sound On Sound article states that Emerson owned a Korg PS3 200.

This Sound On Sound article states that Emerson owned an Oberheim Matrix 12.

This Sound On Sound article states Emerson owned a Korg RK-100.

This Sound On Sound article states that Emerson owned a Korg VC-10.

This Sound On Sound article states that Emerson owned an Oberheim DPX-1.

among the artists listed there Keith Emerson

The site www.brain-salad-surgery.de states that Keith used the hammond C3: "Keith bought his original C3 around 1967. It was the organ that he played on all the ELP tours from the '70s."

Homeboy Keith goes full-on apeshit on a poor L-100 in this video

This article states that Keith used a Moog Apollo in his keyboard rig

This image shows Keith with a gem pro 2

At [36:46] Keith is seen using the Alesis QS8

This Sound On Sound article states that Emerson owned a Korg SQ-10.

Keith Emerson can be seen with his Hammond and Moog Modular Synthesizer in this picture from the Emerson & Lake Tour in 2010.

This Sound On Sound article states that Emerson owned a Yamaha TX816.

The iconic synth of the iconic keyboardist/pianist.

This site states that Keith used the Hiwatt Custom 100 with his leslie cabinets