The score makes use of a series of leitmotifs. Many of these represent individual characters: some of these are fragments of the opera's set numbers (Sportin' Life, for example, is frequently represented by the melody which sets the title words of "It Ain't Necessarily So"). Other motifs represent objects (such as the sleazy chromatic "Happy Dust" motif) or places, notably Catfish Row. Many of the through-composed passages of the score combine or develop these leitmotifs in order to reflect the on-stage action. Particularly sophisticated uses of this techniques can be seen after the aria "There's a boat dat's leaving soon for New York" in act 3, scene 2. The opera also frequently reprises its set numbers (these might be considered extended "Leitsektionen"). Notable in this respect are the reprises of "Bess, you is my woman now" and "I got plenty o' nuttin' " which conclude act 2, scene 1. The song "Summertime" is stated four times alone.