It is a curious fact that there is very little crossover between studies on the visual arts and those on the auditory. There are general cultural histories, to be sure, but even in those the two are generally treated separately, following the habitual trend. There appear to be few people who can think equally easily in or with respect to both modes, despite honourable exceptions such as Richard Arnheim and Raymond Head. Yet there are grounds for thinking that music is intrinsic to the human psyche, starting with the obvious fact that, barring severe pathology, everyone includes music one way or another as an important component in their lives: the inference is that it is necessary. But this is material for wider study (as for example Zuckerkandl: Sound and symbol, Blacking: How musical is man, Tomatis: The conscious ear).