Since I remembered The Wicker Man (1973), I had to go and listen to
Agalloch - Summerisle Reprise The White (originally released in 2008) was an epic EP, one of their best works. Sits right up there with The Mantle (2002) and Ashes Against The Grain (2006). The latter has some amazing pieces, with
Not Unlike the Waves arguably their best song ever.
In the same vein, perhaps even more emotional, I highly recommend Black Lake Niðstång (2010, Marrow of the Spirit)
https://youtube.com/watch?v=oVOONyMkgKk Agalloch's fifth and final studio album (The Serpent & the Sphere, 2014) gave another memorable tune:
Plateau of the Ages Agalloch, over two decades of greatness. Happy to have witnessed their fantastic work live.