"In the evening when the sun goes down" is not the same song as "Every night when the sun goes down," posted above.

The former (from Leadbelly) was also covered by Lonnie Donegan in the good old days of skiffle.

As I remember it, the first verse was something like:

"In the evening, in the evening, mama, when the sun goes down
In the evening, mama, when the sun goes down
Ain't it lonesome, ain't it lonesome, when your baby ain't around."