The Three Moods of Celtic harp tradition

For Fun Friday, I wanted to share a concept called "adban trireach", which loosely translates to "the three moods".  I've put together three Scottish or Irish songs for you today to celebrate "The Three Moods" in a more modern way. If anyone knows more about this concept, please tell me all about it!

I'm fascinated with anything about harps, particularly Celtic harp traditions. To be considered an accomplished musician worthy of their high rank, they were expected to play songs that evoked these "three moods":
-geantraighe = happy/lively 
-goltraighe = sorrowful
-suantraighe = sleepy

In VERY early harping tradition-1200s/1300s, each ruling chieftan considered it a necessity to have a harpist in their court. They ranked just below the chieftan and the bard. And since the pinky was not used in this playing style, they would often amputate the pinky finger of harpers.
I think that's so interesting! 

Happy/geantraighe-Street performers dancing and playing concertina on the streets of Galway. I think this really captures the impromptu joy and "do-it-anywhere" quality of the Irish. 
(Starts :18 seconds in)

Sorrowful/goltraighe -"Amhrán na Eascainne" by Liam Ó Maonlaí & friends
This song is about a man whose new bride serves him a poisoned eel for dinner. The man's sister tends him on his deathbed and asks what he will leave for the rest of his family. It's so depressing, in the best sort of Orkney Islands way.

Sleepy (my favorite)-A Trip to the Islands/Keltische Harfe by Nadia Birkenstock
Here's a soothing harp piece played beside a running stream. This is an original composition by Nadia.