A tonal type is minimally identifiable by its three markers and thus objectively observable completely apart from its musical or cultural context; it is 'scientific,' it is 'etic.' 'Mode' conversely is all bound up in sixteenth-century musical culture, not as a living doctrine of the music of the church and a heritage fomr the Middle Ages but also as a musical construct being expirimented with by members of the culture, from both humanistic and traditional points of view; it is thoroughly 'emic' and requires study on its own terms....

Harold Powers, "Tonal Types", p.439.