Sensory pleasantness depends most on sharpness, then roughness and tonality.

Evidence

In summary, it can be seen that sensory pleasantness depends mostly on sharpness. The influence of roughness is somewhat smaller and is similar to that of tonality. Loudness, however, influences sensory pleasantness only for values that are larger than the normal loudness of communication between two people in quiet. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1373