"Moderato con grazia" is the last A section that returns to the themes set in A. After recapitulating the "walking" themes, Gershwin overlays the slow blues theme from section B in the final "Grandioso".
"mˌɑːdɚɹˈɑːɾoʊ kˈɑːn ɡɹˈeɪziə" ɪz ðə lˈæst ɐ sˈɛkʃən ðæt ɹᵻtˈɜːnz tə ðə θˈiːmz sˈɛt ɪn ˈeɪ. ˈæftɚ ɹᵻkɐpˈɪtʃʊlˌeɪɾɪŋ ðə "wˈɔːkɪŋ" θˈiːmz, dʒˈɜːʃwɪn ˌoʊvɚlˈeɪz ðə slˈoʊ blˈuːz θˈiːm fɹʌm sˈɛkʃən bˈiː ɪnðə fˈaɪnəl "ɡɹˌændɪˈoʊsoʊ".