Here's the tune from the sheet music:

X:01
T:I CAN'T CHANGE IT!
M:6/8
L:1/8
C:Written and composed by T.W.Connor 1894
N: Sung by George Beauchamp
Z:Transcribed from original sheet music by Ruairidh Greig 2011
K:F
c|c2FF2A|d2cA2F|A2GB2G|D3-D2 D|!
E2Gc2c|E2Gc2c|c2BA2G|F3-F2zG|!
G2ec2A|A2GG2G|F2G=B2A|G3-G2G|!
G2ec2A|A2GG2G|A2GA2=B|c3-c||!
c A|:F3-F3|(c2-A)F2F|G3-G3|(d2B)G2F|!
E2dd2d|d2EE2E|F2dd2d|d2cA2G|!
F3-F3|cA2-A2A|G2AB2c|d3^c2d|!
e2dB2G|d2cA2F|D3E2c|F3-F2|]