Songs About Mental Illness?

... every second ...

"The Art of Madness", by the Psychedelic Ensemble...

"a 56-minute, continuous cycle of songs, each based on a different manifestation of madness. The music tells the story of an ordinary man who, without warning, experiences a psychotic Ecstasy. The protagonist sees in the sky tears that turn to a light in which a vision of a new art and music appears to him. His psychotic episodes prompt a course of creative output in which the protagonist reproduces his flights of madness in the form of art and music. The artist endures several psychotic experiences that manifest as Panic, Fantasy, Dream, Delusion, Moon Mad, Despair and Apparition. The artist then endures a Breakdown and Sedation. Finally, in a moment of Revelation, the artist apprehends that the burden of his madness is, in fact, a gift - the source of his exquisite creativity and artistic output. Rather than suffer his madness, the artist triumphantly embraces that which guides him through his extraordinary and distorted vision of the world."

Glad iamthemorning's Lighthouse was mentioned.

T's albums seem to have a lot of it.

Off the top of my head:

TUNE's Lucid Moments is excellent (and eerie)!

Mental dissonance seems to be what so much of prog is about--especially the modern heavy stuff.

SYLVAN's Posthumous Silence could be another.