Treating Floor in New Construction - Reducing Footfall and Vibration

Looking for some good ideas/solutions to treating my new dedicated music room's floor.  The room will be fairly large at 22w x 29L, built on the main floor of the new house with a basement below.  My current room is in my basement with concrete floors so footfall is never an issue.

I have asked the engineering firm to give me some recommendations on making the floor stronger structure wise; not sure what they will suggest, maybe floor joist on more narrow centers, say 12 inch vs 16.  

Have you tackled this issue?  What about mass loaded vinyl (MLV); would a layer of heavy vinyl between the OSB floor boards and carpet pad help?  Use two layers of OSB flooring and glue them together?  Ideas?