Here is what I have found on Melodisc.
MELODISC LTD
10751 DENSMORE AVE N
SEATTLE, WA 98133-8943
COMPANY OVERVIEW
MELODISC LTD is in the LEGAL SERVICES industry in SEATTLE, WA. This company currently has approximately 1 to 5 employees and annual sales of Under $500,000.
Upon further research, I located whom it is:
Registered Agent Information
Agent Name NEIL SUSSMAN
Address 10751 DENSMORE AVE N
City SEATTLE
State WA
ZIP 98133
This information is located on the Tri-Ryche Corporation Registration Page.
Neil Sussman was the band's attorney for eons. I have no idea if he currently is or not.
From my limited knowledge about corporations, these are my thoughts. The companies the band members own are likely S-corporations due to the tax structure (much better than a C-Corp) and small ownership (less than 100 shareholders). The spouses in an S-Corp. are automatic single shareholders which is likely the reason the spouses are named in the lawsuit Geoff and Susan filed. Ex spouses and family are also single share holders as long as they elect to be a share holder. So, for instance if Eddie is divorced, his spouse may have elected to remain a share holder.
Melodisc is another company of the Band- Sussman, as with Queensryche Merchandising Inc and Tri-Ryche Corp, is the agent (entertainment lawyer) whom reresent(s/ed) those entities on renewal of each registration with the state. The companies, which are all set up as different business entities, with different tax structures (i.e. Corporation, LTD) limit individual liability for losses, so the individual owners can't be held responsible to debtors.
Each of the three companies also show each band member/owner in different roles. Geoff is not the President of any of the three companies. Eddie is the President, Chairman and a Director of Tri-Ryche Corp. They are all Vice Presidents and Directors of Tri-Ryche, but Michael is also the Treasurer and Scott is the Secretary.
With Melodisc, Scott is the President, Secretary and Director, Geoff is VP, Treasurer and Director, Michael and Eddie are VP's and Directors.
With Queensryche Merchandising Inc., Scott, again is the President and Director, Geoff is VP, Director, Treasurer, AND Secretary! And yet, Michael is also listed as Treasurer and Eddie is listed as Secretary... Hmmm strange for there to be dual roles for Treasurer and Secretary? Interesting since Tate claims the Merchandise company was the start of disagreement, and we know Susan and family had a lot of control over the store/merchandising. As an aside, and having nothing to do with the business structure, Parker is still listed (as of the last time I looked- a couple weeks ago) as the "contact" for the web store on the Quensryche website (which, is, of course, outdated)- but I am sure he was listed as such when he and Miranda were dating- prior to his guitar role in the band. I have had both, Michelle Maison (Susan's friend), and Miranda answer the store phone (more than a year ago when there was an issue with an order for baby onesies). It was definitely under Tate family control. I am sure there was a reason they wanted to transfer it to a third party.
At least on the business end of things in the governing boards, things seem fairly equal, but a distinction is that Tate is not the President or Chairman of any of the businesses (whether that matters or not). In the Rolling Stone article, Tate said he is "25% holder" in their businesses together, so that makes me think he has equal ownership/profit holding shares. Of course, his family being heavily involved in staffing, the Tates take more of the pie from an employee standpoint, and with Susan as manager, that's probably a big blow to her and to Miranda running the store/Facebook Page. Income and power drops significantly for them.
Based on the "Rising West" KISW Men's Room interview in the first week of June, just prior to their live shows... I personally think that there was no band agreement made on the rest of the band structure, who owns the name, etc. One would think that with Geoff's divorce and Chris leaving and the way they have had to set up business with 3 guitarists that there would be something on paper, but it doesn't seem like it's all set in stone by the way Michael and Scott answer the questions below. I like Scott's french fry analogy too.

I also think Geoff Tate assaulting two of the band members, and perhaps not working in the best interest of the company, as a a Director on a Corporate board should, could prove to be detrimental to his attempted legal maneuver.
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KISW:
Transcription mine.
Scott: "Everything is day by day right now."
KISW: "I tell my kids that all the time."
Scott: “Hey listen, if my kids take my French fries, I tell them I am going to talk to the guy with the tie, because I’m not sure you have legal right to take my fries right now.”
KISW: “In the legal world, how soon will you guys know what’s able to be done and is this something that was set so long ago that you’re… is it like a oh, God, like a marriage that happened 25 years ago where you have to go back and look at the paperwork and see what was done early on to figure out what’s to come in the future is it one of those… like, are you going to have to pay child support?
Scott: “It’s a major work in progress.”
KISW: “Would you give any advice to any bands who are starting out now and getting ready to sign a record deal and making it in the business. Is there any advice that you would give them in hindsight from this experience that would be something good for them to know for down the road in case they do become successful like Queensryche and they do make it in the world. Is there one thing that you would tell them from this experience that you would be something good for them to know?”
Michael: "MAKE A BAND AGREEMENT!"
Scott: “Everything on paper is always good, and Uh, just know everything about what you do. We’ve been through ups and downs for decades. I mean we’ve known you guys for a long time and you know the history of what we’ve done for 30 years.”
Scott then goes on to repeat what he said in the RealTimeTV interview a couple days earlier saying to "know your business, know the people working for you, you’ve got to trust them" etc.
edited to add- the governing board and company information I cited all comes from the WA Secretary of State website in a search under corporations. It's public information.