Sorry, cut myself off somehow. 2. Songs derived from working occupations and made by working people themselves. This group is mostly peasant or working class but there are occasionally other bits and pieces. The group does NOT include songs made by outsiders however sympathetic they are to the occupation except in exceptional circumstances (such as "Singing the Fishing" songs). 3. Songs made for a political purpose, from Chartists, Wobblies, One-Worlders, etc.

These are guidelines rather than strict rules, but it's what my repertoire consists of. My 2c.