I’m into a lot of the pretty extreme metal stuff, so these might be pretty out-of-the-ordinary for most audiophiles. However, they are songs that I know well and actually will listen to, rather than superbly recorded masterpieces that I don’t know well enough in order to evaluate gear effectively.
The top 10 I use for testing/demoing would be:
What a Horrible Night to Have a Curse – The Black Dahlia Murder
Broken Hands – Lamb of God
Reach Beyond the Sun – Shai Hulud
Scoop – Nasum
Death – Crystal Mountain
Of Mind - Nocturne by Tesseract
Esoteric Surgery - Gojira
New Noise – Refused
Blinded by Fear – At the Gates
Marianas Trench – August Burns Red