"Solidarity Forever," the most often sung of all labor songs, was written in 1915 by IWW-member Ralph Chaplin.
The following is the sheet music for the Story of Solidarity, Labor's Anthem:

"And I long to see the day when Labor will have the destiny of the nation in her own hands and she will stand as a united force and show the world what the workers can do." --- Mary Harris "Mother" Jones, 1830-1930

Illinois Labor History Society