"tones" - key terms from Wikipedia

chest tones
contour tones
diverging tones
dtmf tones
eight tones
five tones
four tones
gem tones
level tones
nine tones
pure tones
reciting tones
register tones
scale tones
skin tones
sustained tones
tones
tones	of home
twelve tones
two tones
vietnamese tones
whole tones