And here's roughly Dave van Ronk's tune. The 1/8th notes are swing style.

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X:1
T:Oh, What A Beautiful City
C: From the singing of Dave van Ronk
L:1/4
M:4/4
I:linebreak $
Q:1/4=146
K:G
G4-| G4- | G _B/G/ B/G/ B|G/G/ G/d/-d2-|d4| $
w: Oh__ what a beaut-i-ful cit-y, Mmm__
z =f/d/ f/d/ c| _B/G/ (G/=F/) G2-|G4| $
w: What a beaut-i-ful cit-y, great_ God,_
z _B/G/ B/G/ B|[M:2/4] G/G/ G/G/| $
w: What a beaut-i-ful cit-y, Well there's
[M:4/4] z< c c c/_B/|c< d d/c/ _B|G4| z4 || $
w:Twelve gates to the cit-y, Hal--le-loo.
d d c _B/B/| c< d-d G/G/| d< d (d/c/) _B| G2 z2| $
w: Goin' on down to the riv-er_ Pick my sword up in_ this hand.
d d c< _B| c< d-d/ d/ d| g/g/ d/d/ c/ _B G/-|G2 z G/G/| $
w: Shove my troub-les ov--er I done made it to the prom-ised land_ Well there's
z< c c c/_B/| c< d (d/c/) _B| G4-|G2 z2|]
w: Twelve gate to the cit-y Hal--le-loo._