A big part of the Scottish soul is about being miserable. We are at our happiest being unhappy. Eskimos have scores of words describing snow. We have scores of words based on our unhappy spirit. Many of the above mentioned songs have a dour twist.

Mormond Braes - the singer's boyfriend dies in a wrestling match. Tail Toddle - sexual abuse and harasment.
The Collier Laddie - painfull unrequited love.
The Calton Weaver - alcoholic degeneration.
Nicky Tams - Child slavery and total disregard helth and safety in the workplace.
Fitba'a Crazy - Irish

Happy? Don't make me laugh.