A tonary is a liturgical book in the Western Christian Church containing various chant incipits which is organized according to the eight psalm tones of Gregorian chant. It may include antiphons and responsories from the Mass and Offices. Although they can be standalone works, they were frequently used as an appendix to other liturgical books, like antiphonaries, graduals, tropers, prosers, but also included in collections of musical treatises.
Read more about Tonary: Function and Form, The Carolingian Names or "Byzantine" Intonations For The 8 Tones, The Later Practice of The Intonation Verses, Cross-references Between Tonaries During The Reforms Between The 10th and The 13th Century