This is a rather optimistic song from the 1969 musical Paint Your Wagon. After the bizarre marriage of Ben Rumson to the former wife of a Mormon, she asks him to build her a cabin. Which he does in double quick time with a little help from four hundred fellow miners.
Although the role of soloist Elizabeth is played by Jean Seberg, the voice actually belongs to Anita Gordon.
"A Million Miles Away Behind The Door" was composed by André Previn and written by Alan Jay Lerner. It does not appear in the 1951 stage production.
Suggestion credit: Alexander Baron - London, England, for above 2