"what they draw an audience for is their particular take on traditional song."
Then a small percentage of that audience get interested in where the band got their material from, and discover it's the traditional music itself, rather than that treatment of it, that they really like.

It will always be a very small percentage of the population that does this, but some of those people might never have discovered the music they now love otherwise.

Maybe Nigel will be back soon with his own take on this - I know that's been (some of) his experience.

Anahata