Summertime: Original Version
As a basis for comparison of later versions, consider both a recording of the original "Summertime" aria and the corresponding vocal score and sheet music below. The vocal score is currently published by Alfred Publishing, and the song sheet by the Gershwin Publishing Corp. Despite additional ancillary material in the vocal score not found in the later "Summertime" publication, both are virtually identical.
Both of the above versions are exactly the same in terms of key, form, accompaniment, tempo, and dynamics, and both represent the original operatic style for which the song was conceived.