The controversial song is riddled with profanities used to describe the history of farmworkers.
The song by Cape Town artist, Dookoom, tackles the plight of farm workers in the Western Cape.
The land institute says a proposal awarding portions of land to labourers should be carefully interrogated.
While Cosatu welcomed the pay increase, it said wages were still far too low.
The protest turned violent on Monday when strikers caused chaos, setting a truck alight.
The union says very few farmers stick to the R105 per day agreement.