Question: Where was Summertime sang by Abbie Mitchell? 
Sentence (from "Abbie Mitchell"): Abriea "Abbie" Mitchell Cook (25 September 1884 – 16 March 1960), also billed as Abbey Mitchell, was an American soprano opera singer who sang the role of "Clara" in the premier production of George Gershwin's "Porgy and Bess" in 1935, and was also the first to record "Summertime" from that musical.
Relevant evidence: Yes