Sensory pleasantness rises with tonality only up to a ceiling.

Evidence

The relationship between sensory pleasantness and tonality, i.e. a feature distinguishing noise versus tone quality of sounds, is indicated in Fig. 9.4c. This dependence indicates that sensory pleasantness increases with tonality. Small tonality means small sensory pleasantness. For relative tonality larger than about 0.4, sensory pleasantness does not increase much. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1371