In reply to Pesda potato:
It's a strange one. Mozart can make me smile:
or inspire something like dread:
Bach can make me feel things I can't even put a name to:
AC/DC make me feel energised, Eno is calming - the list goes on. It's overly vague, but I'd hazard that music is the language of emotion.
Re visual pleasure, there's evidence that we have a strong preference for symmetry, although this does nothing to explain your examples of landscapes and waterfalls.
It's a fascinating question you've raised, and I don't have answers. It would be interesting to hear from someone who does.