"The same goes for 'folk' tales, customs, beliefs, dances, music, lore, painting.... it is their common origin which identifies them all as "folk art""(JC)

The words I objected to were 'common origin' and 'all'

"much of the rest originated in high art! Or certainly higher than the common folk, sophisticated sources in other words. Dances in particular." (SG) Note the words 'much of'.

So leaving 'working people devoid of a voice' are your words, not mine.