On five-level tone contrasts: the case of Dan-Gblewo

The central goal of this research is to propose that no language utilizes more than four level pitches contrastively (from low to high). The central question is whether a five- or six-way contrast represents five or six level tones, or a combination of level tones, contour tones, voice quality, and syllable type. We argue that Dan-Gblewo operates a four-level-plus-creaky-voice system rather than a five-level tone system. We show that Dan must be analysed as such from the empirical, experimental, and theoretical perspectives.