In some languages, notably Kikuyu, the association of tones and syllables is completely predictable. In this chapter, we show that a derivational version of Optimality Theory, Harmonic Serialism, cannot account for Kikuyu if underlying representations include preassociated tones. If richness of the base is to be maintained, then underlying representations can contain associated tones in no language, even a language with contrastive tone association. This leads to a discussion of alternative ways of lexically encoding these contrasts, such as sequences of identical tones and diacritic accents.