How to design music room?

Unless you are prepared to do a lot of research I would suggest someone like Rives or Rives to give you advice. Stay away from the high end acoustic companies. They are a rip off. Do a search on the threads here and you will find a wealth of good advice. On the floor you should do a double subfloor with 1/2 inch or better cork in between the two layers of subfloor. You should also consider rubber strips or other separation methods between the joists and the first layer of subfloor.

I have a bow window, which is a big no no. I also have a fabulous view of a pond and great light. I have put systems in the basement for purity, but have opted for ambience. I really enjoy the music much more with a great view and nice light. On the other hand I have taken great pains to install heavy duty drapes for when I want do more serious listening and I have added considerable acoustics to make the room still sound great with drapes open.