hɪz bɹˈʌðɚ, ɡənzˈɑːloʊ kˌæsɪlˈɑːnoʊz jˈuːmɚ, ɪz ɐ nˈoʊɾəbəl ˈɔːɹɡɐnˌɪst, kəmpˈoʊzɚɹ ænd fˈɔːɹmɚ tʃˈiːf kəndˈʌktɚɹ ʌvðə vˌɛnɪzwˈeɪlə sˈɪmfəni ˈɔːɹkᵻstɹə nˈaɪntiːnhˈʌndɹɪd sˈɪksti sˈɪks dˈæʃ nˈaɪntiːnhˈʌndɹɪd sˈɛvənti ˈeɪt.
His brother, Gonzalo Castellanos Yumar, is a notable organist, composer and former chief conductor of the Venezuela Symphony Orchestra (1966-1978).