Double width studs for isolation?

Staggered/double studs plus 2 layers of super-dense drywall (Firewall) both sides as well as fibreglas internal insulation will give the best sound-insulation for the adjoining room. This sound-insulation is called STC (Sound transmission Class) Rating. Compared to a normal drywall with say 37 STC rating, the described wall can double the sound-proofing capabilities up to 60 STC.
STC Ratings
Study Diagrams

I've been seeing ads from a company offering rolls of sheet vinyl. They suggest covering your inner walls with the stuff prior to covering with sheet rock.
Sounds good to me...

Correction.....I am getting old!?
STC Ratings are in Decibels (dB) and thus are logarithmic.
Therefore the improvement of 37STC to 60STC is more than a TRIPLING in acoustic performance.

Good best for isolation is to STAGGER the studs. also, most code is 16" on center. There are various products to weave Between the studs as damper. DO NOT use styrofoam. It is toxic as hell when it burns, and probably against code. The products I have seen are Very heavy plastic.....I have no idea how they do it, but this stuff is pretty heavy, providing mass while meeting burn/self extinguising requirements.
By staggering, you DeCouple the walls 'sharing' the studs.
Just looking up, Elvick calls it 'insane'......Nope, just 'sound' engineering. pun intended.

Magfan, I totally understand the "sound" engineering. However, having renovated many buildings, I know what it's like to have to open up walls to search for studs. That's why I'd push for either 16" studs with random in between or at least a pattern to aid in future finding of the studs?
If I was buying a property with random studs this would greatly devalue the property and would be considered a "knock" down on any wall unless plans were available with exact dimensions and proof of proper construction by a qualified contractor.