Will second:
Some non-metal
Verdi - Prelude to Act 1 : La Traviata
Just one of the finest pieces of classical music I have ever heard. Those lush strings that come in around the 1:20 mark just grab me by the throat every time. Damn.
Little Richard - Send Me Some Lovin
The "glamourous" lifestyle of living in hotels hundreds of miles away from home, usually led to me looking down that long, dank corridor of depression. Wanting to be nowhere but home with the ones you love is a fucking killer and the more positive nature to the tongue in cheek side of Little Richard used to pick me up just enough when needed.
Glaare - Iksy (from To Deaf and Day)
Those haunting synths and those ethereal vocals that grow stronger as the track progresses are just a wonderful combination that connect so well with me. A wonderfully restrained and balanced piece of music that makes me feel a real connection with the artists.