Modern trends - how pouplar is Populism?

Populism has been described as
Bound up with the populist concern for the musical education of ‘the masses’ (through reference to ‘their’ folk-music genres) were topical social and political ideologies, chiefly nationalism and later, at the start of the twentieth century, evolutionism, which influenced the composers’ selection of folk-music themes for their pedagogical works and were clearly evident in their explanatory literature about this music. 

(Rhoda Dullea)

I doubt if many English people could name a folk tune that wasn't Scottish or Irish.