Gershwin's first A episode introduces the two main "walking" themes in the "Allegretto grazioso" and develops a third theme in the "Subito con brio".
dʒˈɜːʃwɪnz fˈɜːst ɐ ˈɛpɪsˌoʊd ˌɪntɹədˈuːsᵻz ðə tˈuː mˈeɪn "wˈɔːkɪŋ" θˈiːmz ɪnðə "ɐlɪɡɹˈɛɾoʊ ɡɹˌeɪzɪˈoʊsoʊ" ænd dɪvˈɛləps ɐ θˈɜːd θˈiːm ɪnðə "sʌbˈiːɾoʊ kˈɑːn bɹˈiːoʊ".