To those who commented, thank you. I've created a wiki page http://wiki.openstreetmap.org/wiki/Tag:amenity%3Dmusic_venue that include the points that most of we were able to agree upon, which is using amenity=music_venue to tag these places.
As for using concert_hall, and other more complex tags, we can continue the discussion on there (or here if you want) and as more of these objects are tagged, more tags can be used. regards, will.
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