Our understanding of the long-term tonal relationships that grow out of seventeenth-century harmonic language is at an elementary stage. An enormous gap seems to exist between our ability to deal with, on the one hand, a sixteenth-century compositional language that basically adheres to a contrapuntal technique and tonally abides by the rules of modality and, on the other, an eighteenth-century tonal language for which we quietly assume harmonic functionality. That scholars have largely avoided an investigation of harmonic language in the seventeenth century is perhaps surprising. Problematic and somewhat enigmatic features of seventeenth-century music are, in some cases, not very different from the characteristics Harold S. Powers attributed to late sixteenth-century modal music: ‘sometimes faintly exotic, often charmingly vague and undirected to our ears, but hardly alien’. Benito V. Rivera appeared to corroborate Powers's perception when he characterized some of the idiosyncrasies of seventeenth-century harmonic practice as ‘isolated harmonic quirkiness’.