The song beginning at 36 minutes with 2 voices , first female , second male with cello , piano and percussion , who are the artist and the name of of the song. It ends at 36.29 seconds. It's very beautifull and i dont find it . Episode 6...Thanks for your efforts. 

Sic Mundus Creatus Est

Regina tells Katharina she should tell her kids what happened when they were younger; Ulrich pages through a photo album and pulls out a picture of himself and Mads; Jonas travels father into the cave; Aleksander consoles Regina.