“Well gee, the 1951 movie adaptation of it won an Oscar and was nominated for two more.”
I don’t recall the ‘n’ word being in any of those songs!
Maybe the stage play had different music than the movie.
The verse to 'Old Man River', in the version I heard went:
'Darkies all work on the Mississippi,
Darkies all work while the white folks play'
I suspect it originally used the 'n' word, but the only way you would here it would be if you had access to the original cast recording from the original production. I'd love to hear it with Robeson and the great Helen Morgan (singing 'Bill')