If you will allow me, I think there's a bit that bears repeating for the benefit of those who skip past the previous excerpt due to its length. These sentences are as succinct an explanation of how changing social conditions can change musical traditions as I've ever read:

"Demands of dancing in large spaces also altered the performance style of music: it did not require solo and duet playing, it sacrificed rhythm to beat, impersonalised the musicians, prioritised music-making over social occasion and obliged musicians to learn other forms of music demanded by the modern venue. Accordion became important, for volume, this diminishing the status of the subtlety inherent in, say, expert fiddle playing. Dancers were thus separated from the process of music-making, standards of appreciation declined, musicians lost local importance, became discouraged and many abandoned playing in a competitive era in which supply was greater than demand."