Using CEDAR planks to sound proof a home music studio
Soundproofing is an entire enginneering principal on its own. Not to be facetious, but you are asking for a definitive answer on soething that has near infinite variables.

Some quick notes, "solid" is not the way to stop sound. Air gaps and breaking up sound-waves is the way forward.

A bit of google on "soundproofing a room" will get you where you need to go, and likely better than a quick home depot fix. I checked and there is some excellent info available.

Good luck, and let us know what you do and how it worked out.

Max