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Interesting discussion! I can’t really advise any better than others on the humidity issue, but as a renovation carpenter, I will suggest one thing. Seems like you have planned for insulation in the walls, but what will you do on the floor? Assuming it’s a concrete slab, if there isn’t insulation underneath, or if you have any moisture issues, consider using Dricore panels (https://dricore.com/products/dricore-subfloor/) as a subfloor surface. They are not cheap, but will make the floor significantly warmer and help with any moisture problems. Otherwise, I’d agree with ChuckS that vinyl plank flooring is the best choice to go directly on concrete.
Anyway, congrats on getting such a great new space for your “music studio” – it might well inspire you to spend even more time playing😀