If you had the budget, you can put acoustic dampening material within the plaster ceiling also.

I have done this as sound proofing for my office at home.

Well. It will help. It won't be 100% unless you willing to spend some real moolah.

Or heck, just get landed properly with land at the sides. Silence.

Until some neighbour's kid who has zero musical aptitude try his hand at the piano, or even worst, fucking drums.

Lord have mercy on thy soul..

Lmao. Fucked either way T_T