Can you name tunes written about mental illness or the expression of?

A biggie that comes to mind for me, and is one of my all time favourite bands is Pink Floyd and tons of their tunes written about one the founding members (David Gilmore, was it?), who left the band in its early stages because of mental illness.

Only one comes to mind at the moment though (because it's stuck in my head) is:

Shine on You Crazy Diamond

but I know many songs have been written about and for him. This was done over many albums. Always thought it was touching that they never forgot him, nor "left him behind" in their rise to success.

Oh, there's another tune, about 5 years old now, about a girl:

"who'll tell you she's an orphan
after you meet her family..." (something like that)

"She says she talks to angels;
says they call her out by her name;
yeah, she talks to angels,
calls them out by their name...

Thought all you guys came up with so many movies, you could help do the same with tunes - in all genres!

Thanks!
AS