dʒˈækmənz ˈɜːlɪɪst nˈoʊn mjˈuːzɪkəl æktˈɪvᵻɾi wʌz æz ɐ mˈɛmbɚɹ ʌv kɔːɹnˈiːlɪəs kˈɑːɹduːz skɹˈætʃ ˈɔːɹkᵻstɹə bᵻtwˌiːn nˈaɪntiːnhˈʌndɹɪd sˈɪksti nˈaɪn ænd nˈaɪntiːnhˈʌndɹɪd sˈɛvənti tˈuː.
Jackman's earliest known musical activity was as a member of Cornelius Cardew's Scratch Orchestra between 1969 and 1972.