There are two songs to the tune in 'The Scots Musical Museum'. For earlier copies of the tune see the Scots tune index on my website (www.erols.com/olsonw). Said to have been a favorite funeral march in the U.S. in the 1st half of the 19th century, according to a book on American Martial music that I once saw.

X:1
T:Roslin Castle
S:Scots Musical Museum, #8, (1787)
Q:120
L:1/8
M:C
K:Cm
E3/2D/|c2G3/2A/ G2FG|AGF E D2E3/2D/|C2c3/2d/e2dc|\
=B3/2c/d B G2FG|AG FE D2E3/2F/|GE DC{c/}=B2cd|\
ec d=B cG F3/2G/|E2D3/2C/C2||G2|\
c2cd e2 dc|g3/2f/ ef {e/}d2c=B|cG cde2dc|\
g3/2f/ e/g/f/e/ {e/}d2FG|AG FE D2EF|GE DC {c/}=B2cd|\
ec d=B =cGF G|E2D3/2C/C2|]