The liturgy of Ravenna Chant (usually discussed as "rîte d'Aquilea" in French, and as "rito patriarchino" in Italian studies) has only survived in small parts by the written transmission of notated manuscripts.
Kenneth Levy already studied the Vigil mass for Easter Sunday, a prominent feature in Beneventan manuscripts, 1970.
Levy, Kenneth. 1970. „The Italian Neophytes’ Chants“. Journal of the American Musicological Society 23 (2): 181-227.
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