In a YouTube video titled "Piano & Keys Gear - Matt Gilder (of the Chris Tomlin Band)," Matt Gilder is shown using a Hammond C-3 organ as part of the Chris Tomlin Band's setup.

Jack Conte can be seen using a Hammond C3 organ in this Pomplamoose music video. He also mentions the organ on the gear page of his official website and estimates it must date back to around 1967.

Jonathan Cain uses a Hammond C-3, as noted on K for Musicians.

In an Instagram post, Adam Wakeman shares a photo of himself recording with his favorite piece of vintage equipment, the Hammond C-3 organ.

Goss (left) performing on the Panhandle Stage during the 2016 Outside Lands Music And Arts Festival at Golden Gate Park on August 5, 2016 in San Francisco, California.

Neal uses the Hammond C3 in his own studio.

Mentioned in this March 1983 Musician article.

Benmont Tench surrounds himself with: Hammond C3, Keyboard Products Leslie, Wurlitzer piano, ARP String Ensemble, Oberheim OBX-A (Petty has one of these, too).

Tench gives more details on the C3 in this May 2017 KeyboardMag article.

What kind of Leslie are you using with your Hammond C3 organ these days?

[Famed keyboard restoration expert] Bill Beer modified my Leslie and my Hammond, close to 40 years ago. It was magic stuff. But when he passed away, he took all of his secrets with him. The Leslie deteriorated, and the Hammond changed. My friend Ken Rich – who’s a brilliant keyboard tech wizard, restored the Hammond his way, but he still kept a lot of what I liked about what Bill had done. He also worked on the Leslie, but it never quite got back to where it needed to be. It was a Solid State model, so I switched to a tube version. And it was great – I used it for the last 15 years or so. But every time I heard “Refugee” or “The Waiting” on the radio, I heard how the Leslie and the guitars co-existed with each other. It’s like the Hammond was loud, but it didn’t take any room away from the guitars. So I went back to Ken, and now I have that Hammond and Leslie combo from Damn the Torpedoes. It’s the closest it’s been since then. The way it rings with the guitars is a real joy.

You’re known to have a real penchant for effects pedals. Don’t you have an effects loop on your Hammond?

Yeah. Bill Beer put that in. I didn’t know there was an effects loop in it. I thought there was a “direct out,” and then I thought that there was a “line in” in case I wanted to run the keyboard that was sitting on top of the Hammond into the Leslie as well. After I had it for about 10 or 12 years, I did a session with The Cult. Someone said, “This Leslie sounds so clean, can you distort it?” And I said, "I don’t think so." And they looked at my Hammond and said, “Oh, you’ve got an effects loop. Let’s get a fuzz pedal!” I was like, “What?” And I was off to the races. I started out with a little Turbo Fuzz, that I also used on a song on the album All Shook Down by The Replacements. Over the years, I’ve tried other things as well. I have a couple of pedals by Line 6, and Ryan Adams, God bless him, gave me a couple of Electro-Harmonix pedals like the Memory Man and the Electric Mistress flange pedal. I also have a tremolo pedal and a turbo boost as well. These are all for the Hammond, and I also use the spring reverb that’s built into it as well. Ever since I got this organ back around 1977, I’ve used this reverb. It gentles it up. Nobody can do what [Band keyboardist] Garth Hudson does. However, there are settings on that Lowrey organ he plays where the attack is a little softer. And that changes the effect of how you play. So I find that using things like the Electro-Harmonix pedals allows me to soften the attack. It’s fun. I even have a Line 6 modulation pedal on the DX7 to give it a little bit of chorus. That makes it tolerable. I also sometimes run my Vox Continental through a Leslie simulator.

The C3 is also mentioned in this February 2014 Reverb.com interview.

My favorite is my Hammond C3 organ that I got in 1978. I have one in my house, but this was the first Hammond I ever owned and it’s been on every Heartbreakers record but the first two, and on every tour we’ve ever done since ’78. A guy named Bill Beer modified it, and he was secretive. When he passed away I went to have it serviced, but Bill had wiped out a lot of the serial numbers and disguised the parts, so you couldn’t quite trace what he did to it. It’s on “Refugee” and everything else. It’s just a beautiful sounding instrument and it’s the favorite thing that I play.

Towards the lower part of this page, a tour program featuring Moraz' gear states he used a Hammond C3.

Attached is a picture of Steve playing his C-3 in the studio.

On the official Gentle Giant website, there is a list of all instruments played by every band member of this amazing band.

On his right hand in this photo he's playing a Hammond C3

In this video, Rolie can be seen playing a Hammond C-3 organ with Santana in 1971.