[from Baltimore Evening Sun, 10 Aug 1962]
Although this link is old (2005) you might be able to trace the person that posted at the end of the string, who is the wife of Helen Colbert's son. Google Answers: Information on Helen E. Colbert - Opera Singer
Dear Mr. Beezley,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog for any records relating to “Porgy and Bess” and located 1 series, 32 file units & 52 items in various record groups and collections that might be of interest to you. Please note that some of the records have been digitized and may be viewed using the Catalog. For access to non-digitized records, please contact the unit listed in the description.
We also suggest looking into the Name Index, 1910-1973 to records in the series titled Central Decimal Files, 1910-1963 and Subject-Numeric Files, 1963-1973 in the Records of the Department of State (Record Group 59) as there may be references to documents on Helen E. Colbert and “Porgy and Bess.” For more information about these records, please contact the National Archives at College Park - Textual Reference (RDT2) at firstname.lastname@example.org.
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We hope this is helpful. Best of luck with your research!
Dear Ms. Naylor, thank you for sending this helpful information. Bill Beezley