1. The World Turned Upside Down, composed by Leon Rosselson in 1975, see https://secure.wikimedia.org/wikipedia/en/wiki/Diggers%27_Song
2. Which Side Are You On? composed by Florence Reece in 1931, https://secure.wikimedia.org/wikipedia/en/wiki/Which_side_are_you_on
3. There is Power in a Union, composed by Joe Hill in 1913, https://secure.wikimedia.org/wikipedia/en/wiki/There_is_Power_in_a_Union
4. John T Was a Banker, Billy Bragg 2011
5. The Internationale, https://secure.wikimedia.org/wikipedia/en/wiki/The_Internationale