Korg M1 can be seen at 1:00 on the video.

So, yeah, I have a Korg M1 that I use for the bass because it has a bunch of nice bass sounds.

Garcia uses his Korg M1 in "Como Conseguir Chicas" and "Filosofia Barata y Zapatos de Goma"

In the video "ATB feat. York - The Fields Of Love (Live at VIVA Interaktiv)" at the 1:50 mark, ATB can be seen using the Korg M1 synthesizer.

In this article Bicep say: "We have (or borrow) Korg M1, Yamaha DX7, SH101, Juno 6, Roland midi keyboards, Akai MPC 2000xl and Mackie monitors."

Per this May 04, 2021 feature from gearnews.de:

Now a more technological phase begins and there are several interesting mixes with strong use of the TR-909. The nineties are almost at the end and Front by Front has long been recorded. Their sound with the "emulator" as the center was still considered THE appearance. In the phase after that, the emulator disappeared. A Nord Lead is spotted on stage but also a Korg M1 or a Korg Z1

We can see Billy Joel playing a Korg M1 during This David Letterman appearance from 1993. https://www.youtube.com/watch?v=5f_7YhghqpQ

This site states that Cale uses a Korg M1.

Dolores O'Riordan can be seen playing the Korg M1 in the video titled "The Cranberries - Ode To My Family Live From Vicar Street," on YouTube.

Greg Phillinganes uses the Korg M1 throughout Eric Clapton's "24 Nights" performances, as seen in the YouTube video titled "Eric Clapton I Shot The Sheriff Royal Albert Hall1991."

From a Synth History article written by Roger O'Donnell:

I had been in discussion with the people at Korg about a sponsorship deal, but it wasn’t going anywhere. We arrived in NYC in 1989 to start the US leg of the Prayer tour and we were to play the MTV Awards show in LA, live. Miraculously, when Kong found out, a brand new M1 arrived in my hotel room within about 30 minutes.

I believe the M1 is the most popular, in terms of sales, instrument ever made, 250,000 units. It was a sample player, they were called romplers. The samples were hard loaded in ROM memory - you couldn’t sample into it and you couldn’t really edit it - but the samples were of such an incredibly high standard you didn’t need to. It was also a workstation, so you could program songs into it, which is something I've never done. It also had onboard effects, which really was the start of a whole new wave of instruments. I loved the fretless bass and used it on many recordings. I also used it on some Cure recordings, specifically the session for the Arista anniversary record, and our versions of “Hello, I Love You” by The Doors. I had it onstage during the remaining Prayer tour shows but I don’t think I played it much.

Yanni used the Korg M1 in many songs. The one recorded example I could find was from the main chorus from 'Within Attraction'. You can see it on the top of the left-side tier.