ðə ɹˈaʊd nˈʌmbɚ "ɹˈaʊd nˈʌm" fˈiːld mˈeɪ biː jˈuːzd æz ɐ kɹˈɔsɹˈɛfɹəns tə ðə ɹˈaʊd fˈoʊk sˈɔŋ ˈɪndɛks ɪtsˈɛlf ɪn ˈɔːɹdɚ tʊ ɪstˈæblɪʃ ðə tɹɐdˈɪʃənəl ˈɔːɹɪdʒˌɪn ʌvðə wˈɜːk.
The Roud number – "Roud num" – field may be used as a cross-reference to the Roud Folk Song Index itself in order to establish the traditional origin of the work.