Greenway suggests that the Wobblies stumbled upon this modus operandi as a means of combating the street bands of the Salvation Army and the Volunteers of America, who frequently would drown out Wobbly speakers in a “cacophony of cornets and tamborines.” One enterprising IWW organizer, wishing to combat the forces of obscurantist “pie in the sky” theology, "retired long enough to organize a brass band of his own.
Denisoff, R. S. (1970). The Religious Roots of the American Song of Persuasion. Western Folklore, 29(3), 175. doi:10.2307/1498356
Off the top of my head, I can only think of primary sources. Would need to dive into some academic tools to find sufficient sources for Wikipedia’s requirements. I’ll make a note to do so, when I get the time to do so.
Can you back that up ? https://en.wikipedia.org/wiki/Talk:The_Salvation_Army#Biased_History
Denisoff, R. S. (1970). The Religious Roots of the American Song of Persuasion. Western Folklore, 29(3), 175. doi:10.2307/1498356
Not OP, but I found this: https://en.wikipedia.org/wiki/The_Preacher_and_the_Slave
Ah that makes sense, they were competing for the same demographic for their recruitment efforts.
Off the top of my head, I can only think of primary sources. Would need to dive into some academic tools to find sufficient sources for Wikipedia’s requirements. I’ll make a note to do so, when I get the time to do so.