In the musical Porgy and Bess, the song Summertime has the line in print
"Oh, yo' Daddy's rich and your Mama's good looking."  The few times that I
have heard Caucasian singers do that line, it was just as written with
the exception that Yo' > Your.  Virtually time that I heard an
African-American sing the song--especially in Charleston--the line went,
"Oh, yo Mammy's rich and your Pa is good looking.  Is the change class,
cultural, ethnic, or what--my in-depth exposure to Charleston was 1975--76. 

Scott Catledge

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