Any musical instrument that sits on a floor,
drums, conga, cello, string bass, piano, dancing, etc.
will sound different on an inert massive slab floor than a raised wood floor.
No concert hall stage that I know of is solid & non resonant.
Musicians certainly prefer to get something back from the floor.
At Right Track A509 scoring room, we deliberately built a raised wood floor above the decoupled concrete isolation slab.
2" X 8" joists 16" OC, space between joists filled with R19 fiberglass, 3/4" plywood, 3/4" MDF, 3/4" finish plywood. Staggered seams between layers. No sealant applied to the top plywood layer.