An incredibly beautiful song and an excellent ear worm! I am listening to it over and over, so I just have to take a small revenge: https://www.youtube.com/watch?v=fmRVQzuVWZU. (The sound is poor, and the actors' play is a bit too dramatic, but the video has English subs. I prefere the later version: https://www.youtube.com/watch?v=WXsptdINflM)
Meanwhile, I have one question. There is a line in this song: Vi gick vilse och började se spöken. Does it mean that they really saw ghosts? Or maybe it is an idiom and they just had hallucinations?
The previous line reads "Över prärien kom vi till en öken" (öken = desert), and the English translation on Youtube for "spöke" is "mirage", so I strongly assume that the song refers to a Fata Morgana: https://en.wikipedia.org/wiki/Fata_Morgana_(mirage)
I thought the music must be based on Moberg's novels as the names and the implied story fits the music, especially as the YouTube performances (Du Måste Finnas is on there too) were recorded in a concert in Minnesota, my home state. I wish I could have been there for it.
it's from a swedish musical called 'Kristina från Duvemåla' (1995)