I’s out there painting on the old woodshed
When a can a black paint it fell on my head
I went down to scrub and rub
But I had to sit in back of the tub

from Bob Dylan – I Shall Be Free Lyrics on Rap Genius

Meaning

A reference to racial segregation and the Jim Crow laws that required blacks to sit in separate sections of stores and restaurants and on the back of city buses.

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