Specifically record sales figures and perhaps radio listeners. I am interested in live audience numbers but I think it is highly unlikely that anything than perhaps individual festival ticket sales numbers exist. As far as definitions are concerned, my dissertation is specifically focussing on music with an easily identifiable root in a tradition, that is or has been played in England in the last 30 - 40 years. Very wide I know as you could easily say all music has a root in a tradition.

I think it depends more on how the music industry defines folk/roots rather than how I define it.

Thanks

Louisa