Key of A

spicy3 - 4 for the entire song

This is a great example of how spicy 3 is used for the"dark/evil/mysterious" vibe. Be prepared to hear this sound used in this way many times.

I like the overall arrangement of the song, especially the choir stuff. 

Key of B

spicy3 - 4 - 4 - spicy3

Similar to the song above 

Key of Bb

Written generally around D, and that D is blatant spicy 3 during the melody at 0:14. Lots of b2 in general in this song as well, very common in this style.

At 1:25, this spicy 3 actually resolves to 6 (Gm) for a moment. So you could also look at this song as a super long 5 of 6.