In summary, opera combines most classical arts : music, dancing, theatre, even poetry or painting for instance can be included. Thus is one would restrict to this category, it would appear in some sense, opera (of a generalized form) could be considered "perfect".However, it is of course a matter of taste, and Russ has a very relevant point : sensibility. Thus, commenting on one of his students dropping off for poetry, Hilbert remarked "I never thought he had enough imagination for mathematics".IMO...calligraphy,especially Chinese [& Japanese], Indian, Persian [& arabic] calligraphyI think truly good writing is a high art.
Tricky considering Vogon is also described as the third worst poetry of the universe, but just maybe there is room for improvement in all three of the last posts by combination, in the form of Vogon-style-versed-pf-replies-accompanying-Bach's solo suites for violin and cello.