OK - take Eisteddfodau. (singular: Eisteddfod) It depends entirely on your point of view: some would say that they kill 'the tradition', some say they preserve it, some say they 'are' the tradition. Hmmmm. They have certainly played a major role in the past in folk song collection, as well as collection of other folk lore like stories, oral history, epitaphs, etc. and there are a lot of songs that would have been lost without the Eisteddfodau. (Big ones, like the National, but also small ones like the town and village ones.) On the performance side, however, they've rather killed off (in some people's opinions ... including my own) styles of delivery which were very 'Welsh' and replaced them with a Western 'art song' / concert platform performance.

So ... "yes" or "no". Take your pick!

sian