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The Nina Simone Database
Porgy, I Is Your Woman Now
1935 George Gershwin, Ira Gershwin, DuBose Heyward
... Nina sang the opening lines of another Gershwin song, "Bess, You is My Woman Now." But on this night [Newport 1963] she remade it to suit her purpose. "Porgy, I's your woman now," she sang, teasing out each word, until half-way through, as if jolted by an entirely new thought...
-Nadine Cohodas Princess Noire: The Tumultuous Reign of Nina Simone

From the opera Porgy and Bess (1935), second act, scene 1.
Music by George Gershwin (1898-1937), lyrics by Ira Gershwin (1896-1983) and DuBose Heyward (1885-1940).

See also from same opera:

Recording sessions
1961: New York
Porgy I's your woman now I is I is
And I ain't never going nowhere
Less me and you share the fun
2000 April 13-14: São Paulo (BR) Via Funchal