Because medieval music theory was dominated by ecclesiastics, it is often difficult to determine from the existing manuscripts just how the secular medieval music sounded. Corvus Corax draws on a number of sources to try to make their music as authentic as possible: they have used documents that "condemn profane music" as an indicator of what the music might have sounded like, and drawn on nineteenth century scholarly treatises for information. In many cases these treatises are unreliable, as they impart more nineteenth century "interpretations" of medieval music than factual information on what the music was like.