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SCOLICA ENCHIRIADIS AND THE ‘NON-DIATONIC’ PLAINSONG TRADITION

Although medieval plainsong is known as a primarily diatonic repertory, the presence of a ‘non-diatonic’ tradition was brought to light long ago in the work of Jacobsthal, Delalande and others. This essay considers some aspects of this practice that have not been fully examined in previous studies and explores their relationship to early medieval theory and pedagogy. In the solo verses of the offertory chants, large sections are displaced from the diatonic background scale, sometimes permanently. The conception of irregular semitones presented in Scolica enchiriadis yields insight into this extensive ‘non-diatonic’ practice and has implications for interpreting variant readings of these problem spots. The final section of the essay explores some aspects of the Enchiriadis reception that point to changes in tone-system and pitch conception, shedding light on the contexts surrounding the suppression of irregular semitones.