I had a portion of the basement converted into a dedicated audio room. 2 3/4 sides have concrete walls, but the remaining 1 1/4 side, I installed double dry wall on both sides with Green Glue between them. I have carpet over concrete and it has worked great for me. Your wife will also love it.
@ghosthouse has mentioned about GIK panels - these will work great when placed properly.
@ghosthouse has mentioned about GIK panels - these will work great when placed properly.