In some tone languages, contour tones (pitch changes within a syllable) may be used contrastively. The phonological distribution of contour tones has been of much theoretical interest, as it sheds light on both the representation of tone (Woo 1969; Leben 1973; Goldsmith 1976; Bao 1990; Duanmu 1990, 1994a; Yip 1989, 1995) and the relation between phonetics and phonology (Duanmu 1994b; Gordon 199...