Theodor Adorno’s Aesthetic Theory - Truth

The artwork has an internal truth content to the extent that the artwork’s import can be found internally and externally either true or false. Such truth content is not a metaphysical idea or essence hovering outside the artwork. But neither is it a merely human construct. It is historical but not arbitrary; nonpropositional, yet calling for propositional claims to be made about it; utopian in its reach, yet firmly tied to specific societal conditions.

Standford Encyclopedia of Philosophy