Leroy Carr wrote the song, and I believe recorded it more than once. It has been covered a million times: I expect a lot of us in the UK first heard it on a Lonnie Donegan EP. There was a very good Big Bill Bill Broonxy version, also Leadbelly as already mentioned.
Here are the published Leroy Carr lyrics:

1:
In the evenng in the evening
Baby when the sun goes down
In the evning in the evening
Baby when the sun goes down
Oh aint it lonesome aint it lonesome
When your lover cant be found
When the sun goes down

2:
Last night I lay a-sleeping
Thinking to myself
Last night I lay a-sleeping
Thinking to myself
Well I thought she loved me
Found she loved somebody else
When the sun went down

3:
Well the sun rises in the east
Sets down in the west
Well the sun rises in the east
Sets down in the west
Lord aint it hard to tell hard to tell
Which one will treat you the best
When the sun goes down

4:
Goodbye my sweet and loving baby
You know I'm going away
Be back to see you
Some old rainy day
Well in the evening in the evening
When that ruby sun goes down
When the sun goes down

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