I don't think separating rock music venues and concert halls is a good idea. They are basically the same thing, a big room where music is played.
Well, when you think of it there is a difference, concert halls usually have chairs. Is that a good separator of the two? Maybe we could invent a tag like "music=rock;classical;popular" that differentiates those halls, and tag them all with amenity=music_venue. Janko Mihelić
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