Premise: `` Stiff Upper Lip '' is a 1937 song composed by George Gershwin , with lyrics by Ira Gershwin . `` Summertime '' is an aria composed in 1934 by George Gershwin for the 1935 opera Porgy and Bess .
Hypothesis: In 1934 Summertime (George Gershwin song) was composed for an opera.
Label: ENTAILMENT