Found the following at this site: Arlo Guthrie Lyrics site

Apparently the credits apply only to this adaptation, but the copyright lists this as earlier than the ones Stewie gives above--? Still assuming it must have been a spiritual originally.

Valley To Pray Adapted by Doc Watson,
Additional adaptation by John Pilla and Arlo Guthrie
co-produced by Van Dyke Parks

I went down in the valley to pray
Learnin' about the good old way
And who would wear the starry crown
Oh Lord, show me the way

Oh Brother, let's go down
Come on down, don't you want to go down
Oh Brother, lets go down
Down in the valley to pray

As I went walkin in the valley to pray
Learnin' about the good old way
And who would wear the starry crown
Oh Lord, show me the way

Oh Father, let's go down
Come on down, don't you want to go down
Oh Father, lets go down
Down in the valley to pray

I went out walkin' on the mountain to pray
Learnin' about the good old way
I went up on the mountain and I just had to say
Oh Lord, show me the way

Oh Sister, let's go down
Come on down, don't you want to go down
Oh Sister, lets go down
Down in the valley to pray

As I went down in the valley to pray
Studyin' about the good old way
And who will wear the starry crown
Oh Lord, show me the way

Oh, let's go down
Come on down, don't you want to go down
Oh, let's go down
Down in the valley to pray

©1970 Howard Beach Music, Inc. (ASCAP)