My favorite is Elven Sunrise. I still remember it playing when I finised Plague's End back in 2014 and the cutscene started when I entered Prifddinas. I could feel my heart pump and my eyes got wet of the tears that almost bursted out. I had finally done it after all the quests and skilling grind.
I really love the elven songs. They are really beutiful and well made. Much kudos to whoever compossed it.