That first link was to an article publish in Traditions magazine, which is relatively new. It looks very interesting. Here's what they say about themselves:

>>Traditions is a journal of folklore and traditions. The magazine made its first debut release this October 2004. Our mission is to provide innovative and well-researched information to our readers. We offer an opportunity to explore folk traditions using both scholarship and experience.

We are an independent magazine centered on folklore, cultural traditions, history, and the occult. Our articles feature such topics as archaeology, cosmology, customs, folklore, hagiography, herbalism, history, magic, mythology, and superstitions. We do not publish fiction.<<

They are selling subscriptions. It is published 4 times a year.
If interest, you can find out more by clicking HERE



In reading that article, I learned that the white water horses that scared the beejeezus out me as a kid are not selkies or Pookas but more likely a throwback to a much older tradition. As mentioned earlier in this thread, enchanted water horse traditions are highly local phenomena with a great deal of variation from place to place. That first article is a great overview of them all and a good place to start. I'm sure with a little more time, I can dig up some more songs but most will probbaly be modern attempts to co-opt Gaelic folklore.