ɪn lˌɑːs ˈændʒəlɪs, mˈæsi wʌz ɐn ˌɛndʒɪnˈɪɹ, pɹədˈuːsɚɹ ɔːɹ mˈɪksɚɹ ˌɔn ɹᵻkˈoːɹdɪŋz fɹʌm ˈɑːɹɾɪsts ɪŋklˈuːdɪŋ ˈɛɹoʊzmˌɪθ, bˈeɪbɪfˌeɪs, bˈɪɡ dˈædi kˈeɪn, bˈɑːbi bɹˈaʊn, pɹˈɪns, dʒˈuːlɪˌoʊ ˈɪɡəlʒəz, sˈiːl, skˈʌŋk ˈænænsi, pˈɔːlə ˈæbdʊl, rjuːˈɪtʃi sˌækɐmˈoʊɾoʊ ænd mˈɛni mˈoːɹ.
In Los Angeles, Massy was an engineer, producer or mixer on recordings from artists including Aerosmith, Babyface, Big Daddy Kane, Bobby Brown, Prince, Julio Iglesias, Seal, Skunk Anansie, Paula Abdul, Ryuichi Sakamoto and many more.