I listened to the third of your links as well John. Thanks. I shall have to listen to it again. It did not carry me away first time, but a lot of music works more subtly. Catch it at the right time and you have it in you forever. The second link is not available here in Germany.
We used to sing a bit of Vaughan Williams when I was a choirboy forty something years ago. I recall hearing somewhere that Williams was very interested in folk music. The first piece certainly bears that out.
By the way, there is a four bar sequence in Smetana's "Bartered Bride Polka", which reminds me of the air used for the Irish folk song "I'll tell me Ma". Is this a coincidence?