Before he died, Robert Johnson left only 29 recorded songs, with 13 alternate versions. The songs were recorded in 6 sessions, over three months apart. The songs were released on the Vocalion label as "race records", the cheapest possible records to sell. The songs themselves, like most blues songs, aren't usually specific. Their importance lies in the emotion the song conveys, not the so much the events taking place within the song.
"You'd better come on in my kitchen
babe it going to be rainin outdoors.
Ah the woman I love
took from my best friend.
Some joker got lucky
stole her back again.
You'd better come on in my kitchen
babe it going to be rainin outdoors."
The song conveys sorrow, pain at finding out his woman has left with a friend. But its also the intense vulnerability that he displays in telling the same woman to come back. That outside its going to be raining, its gonna be hard. But no matter how hard their past feelings may be, the door is still open.