M*A*S*H (an acronym for Mobile Army Surgical Hospital) is an American war comedy-drama television series that aired on CBS from September 17, 1972 to February 28, 1983. - Wikipedia

After some time searching for the Song, a full Soundtrack or even an livetake where the singer Loudon Wainwright III "maybe" repeats this song clear i got stuck!
Soo... made reconstucted the song and equalized the soundtrack as good as an amateur like me could!
So enjoy the song "North Korean Blues" from "Loudon Wainwright III".
This is the best cut you can get, i think :-)

TV Show: "M*A*S*H"
Season 3 Episode 2 - "Rainbow Bridge"
Singer: "Loudon Wainwright III"
Song Name: North Korean Blues

Lyrics:
Oh Tokyo.
They got some sake, and sashimi, and some clean sheets
Oh kimono, kimono, kimono

Tokyo's the town that I love the best
East may be East, and West may be West
Forget about between, it'll drive you insane
And teach you things you never knew before.

Oh Tokyo.
They got some sake, and sashimi, and some clean sheets
Oh kimono, kimono, kimono

Tokyo's the town that I love the best
East may be East, and West may be West
Forget about between, it'll drive you insane
And teach you things you never knew before.

[Instrumental]

Oh Tokyo. They got some sake, and sashimi, and some clean sheets
Oh kimono, kimono, kimono