Right. The melody is from Rossini's "William Tell", which, in the 180 years or so since it was written, has been produced in its entirety exactly once. The complete opera runs over 8 hours in length. I makes me wonder how many other delightful tunes are included somewhere in that mountain of music.

Zipster, I agree that this song may not be a true reflection of anything particularly Scottish, but I think it IS a reflection of a deep human feeling - that of a love and longing for _home_. The Welsh call something similar "hiraeth" (heer'-ithe)