OK Dicho, thanks for providing the cites for those song collections. But I don't think that the existence of the songs means, by extension, that black audiences then and now, found them humorous.

Considering how popular these songs were, and the fact that the minstrel circuit was one of the few venues where black entertainers were allowed to perform professionally, they had a strong economic and artistic incentive to compose songs and perform the minstrel shows according to the white audience's standards, not black audiences. The main audiences, as I understand it, were white, not black, right up to 1900.

Blacks certainly didn't have to think the songs they were composing humorous--just effective. Same with the audiences. I guess I'd rather have evidence of some scholarly analysis of how black audiences perceived the minstrel shows, rather than just the songs themselves, as justification of your suggestion I quoted.