Music.capital is great. Might be a good way to promote Nashville music or any city that might be able to lay claim as a "capital" in a musical genre. I'm sure there is other routes to take rather than just geo-location as well.
I'm thinking low to mid xxx in a couple years.
UPDATE:
The more I think about this, I would wait for the right buyer in the area I described above and may even pull in low x,xxx in a couple years once these new TLD's start to sink in more with the general public. Like mentioned above, a good idea is to promote it with the Nashville scene or similar. Great catch by the way.