The Origin and Nature of Folk Music: As Exemplified in the Welsh National Melodies was originally published in 1911. Kenneth Morris was a fantasy writer and Theosophist from Wales. In this short piece, he looks at the bardic poetry and chants of Ireland, Wales and England, called a "hwyl".
I am not sure I agree with these ideas in full, but this was interesting.
The narration is clear and pleasant, but be warned that the Welsh words are not pronounced correctly. Probably not important, unless you do speak enough Welsh to be confused.