Black tie dress is the most common outfit for men, although fashion may dictate not wearing a bow-tie, and musical performers sometimes do not adhere to this (the artists who recorded the nominees for Best Original Song quite often perform those songs live at the awards ceremony, and the fact that they are performing is often used to promote the television broadcast).
blˈæk tˈaɪ dɹˈɛs ɪz ðə mˈoʊst kˈɑːmən ˈaʊtfɪt fɔːɹ mˈɛn, ɔːlðˈoʊ fˈæʃən mˈeɪ dˈɪkteɪt nˌɑːt wˈɛɹɪŋ ɐ bˈoʊtˈaɪ, ænd mjˈuːzɪkəl pɚfˈoːɹmɚz sˈʌmtaɪmz duːnˌɑːt ɐdhˈɪɹ tə ðɪs ðɪ ˈɑːɹɾɪsts hˌuː ɹᵻkˈoːɹdᵻd ðə nˈɑːmɪnˌiːz fɔːɹ bˈɛst ɚɹˈɪdʒɪnəl sˈɔŋ kwˈaɪt ˈɔfən pɚfˈɔːɹm ðoʊz sˈɔŋz lˈaɪv æt ðɪ ɐwˈɔːɹdz sˈɛɹᵻməni, ænd ðə fˈækt ðæt ðeɪ ɑːɹ pɚfˈɔːɹmɪŋ ɪz ˈɔfən jˈuːzd tə pɹəmˈoʊt ðə tˈɛlᵻvˌɪʒən bɹˈɔːdkæst.