Somebody was asking for this tune, as the possible tune for a song by Lady Nairne, but the forum search doesn't locate the thread.

X:2
T:The Banks of Earn
S:Alexander Walker
S:A Collection of Strathspeys, Reels, Marches, &c.&c.
S:for the Pianoforte, Violin and Violoncello
S:pub John Marr, Aberdeen, 1866
S:p67
M:C|
L:1/8
Q:1/2=112
K:G Minor
g|G/G/G (BG) dGBg|AFcF dFAF|G/G/G (BG) dGBc|dba`f g2-g:|
a|bgdg       Bgbg|afcf cfaf|bgdg       BgdB|AdD^F G2-G
g|bgdg       dgbg|afcf Afaf|bagf       edcB|AdD^F G2-G|]

Not my idea of a promising song tune but maybe you could slow it down and get something. It's very similar to "Lord Kelly's Reel" and several other Scottish G minor reels and strathspeys of about a century before - Walker was about as original as Andrew Lloyd Webber.