This recording is believed to use the taxi horns in the way that Gershwin had intended using the notes A-flat, B-flat, a higher D, and a lower A.
ðɪs ɹᵻkˈoːɹdɪŋ ɪz bᵻlˈiːvd tə jˈuːz ðə tˈæksi hˈɔːɹnz ɪnðə wˈeɪ ðæt dʒˈɜːʃwɪn hæd ɪntˈɛndᵻd jˈuːzɪŋ ðə nˈoʊts ˈeɪflˈæt, bˈiːflˈæt, ɐ hˈaɪɚ dˈiː, ænd ɐ lˈoʊɚɹ ˈeɪ.