Surely the question is about WHAT is to be proscribed?

One would not expect to be allowed to play traditional music in a jazz club, or bubble gum pop in a Country and Western club.

The reason for forming a specific type of club is to promote that particular genre and bring it to a larger number of people.

In the beginning of our club the large turnouts was the "new" experience of sharing the old songs the magic of the blend of voices, raising the roof in one song and shedding a little tear in the next.
Gradually the "performers" moved in and people began listening rather than participating....."evolution"/"devolution" took place, the crowds began to drift away as the singer song-writers took over.

Few wanted to listen to their refrains of self pity.

I began to be about getting big names to fill the venue.....the revival had been hijacked and strangled.