I need stuff that helps me trance out (I'll start focusing on the music instead of what I'm writing) so I listen to a lot of music similar to Wardruna (neo-pagan viking stuff)
https://www.youtube.com/watch?v=V-Rj1GS9anA
And I've recently been listening to the Fassbender 'Macbeth' soundtrack, which is pretty inspiring but also helps me focus especially when writing creepy stuff