Well, there are many that remind me of daydreamy atmosphere, but what usually gets me in the right mood are those fan edits with Johnny Depp movie scenes and music in the background, so I have unintentionally made an association with those songs, my favorite edits have some Lana Del Rey ones and (I know you'll laugh) "Love me like you do" XD But what's really dreamy one and makes me think of lucid dreaming (Vanilla Sky!!!) is "Elevator Beat" by Nancy Wilson <3 Or "Children" by Robert Miles. OR something by Tangerine Dream... Well, but nothing can beat any Johnny edit LOL This is one with "Come cover me" by Nightwish (to continue your Tarja aesthetic) but, maybe I'm saying too much, but I would make one with "Nymphomaniac Fantasia" LOL