Makkon.
Besides what's already been listed, here are a few good songs :
Hymn To The Moon (For The New Lunar Republic vocal remix) :
http://www.youtube.com/watch?v=WTZE2M0XzU8And all of her other songs, cause they're all awesome. Every. Single. One.
Kinda pop-rock, which I don't usually enjoy too much, but I'm liking the simplicity and authenticity of this one : Memory Lane by Osoth, as covered by Forest Rain :
http://www.youtube.com/watch?v=A_OVYPY2Oe4Luna's Ruse by Zahqo and Haymaker :
http://www.youtube.com/watch?v=-BjO2pXcqJISome really weird but surprisingly enjoyable stuff :
http://www.youtube.com/watch?v=oXsW9QEE8LYChecks out his other, more conventional works, he's got a great voice when he actually sings instead of... I don't know what that was.
Same deal :
http://www.youtube.com/watch?v=F4Frv3pqRQcThe rapping in the first two minutes could be improved, but the songs really builds up to something spectacular.
Back in the days by Yelling At Cats (MCMIAG remix):
http://www.youtube.com/watch?v=CxRAhjiaNA0