The only composers whose names have come down to us from this time are Léonin and Pérotin.
Besides trouvère monophony, Karp has written articles on the polyphony of the schools of Saint Martial's, Santiago de Compostela, and Notre Dame.
The work is based on an ancient gradual of the same title, which was previously expanded upon by composers of the Notre Dame school.
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He is mainly noted for having written about Léonin and Pérotin, thereby assigning names to two of the composers of the music of the Notre Dame school who otherwise would have been anonymous; Léonin and Pérotin are among the earliest European composers whose names are actually known.