Building a Music Room

In my basement room I decided to lay commercial floor tile (like you see on a Walmart floor) and use large area rugs to help dampen the environment. I'm very pleased with the results.
For a garage floor I'd epoxy paint the floor and use large area rugs as well. Regardless of what is chosen as a floor covering; seal the floor!

Dedicated lines are a worthwhile investment.

Are the garage walls already sheetrocked?
Will the garage door still be a functioning item or will this become a (semi) permanent wall?
How big is the garage?
Ceiling height?
Attached to the house?
Heated/air-conditioned?

If you can get your hands on the recent Acoustic Sounds catalog (http://store.acousticsounds.com/) they have a nice write-up regarding the listening room they recently had built.
Why this article is not available on their web-site baffles me. Well at least I could not find it so as to provide a link.

I spent around $20,000 but around half of that was because I built a new garage in front of the old one...So, around $10,000 for me: 25'x 23'x 9' was what I wound up with for my dedicated room. You can see mine by clicking on my system link. Of course I did the labor...labor is around 50% of cost if you hire someone.

How large will your room be?...how high is the garage ceiling?

Dave

I actually built my room under the garage - dug underneath it - in an architect approved design. Good news, your floor will be solid and gently sloped (not parallel to your ceiling). If you can vary the surfacing of the remaining walls and maintain a good width to length ratio, you will likely get very good results from the get-go. Good luck with the project.

If it's DIY our resource section may help you.