All of Red Seas Fire's music can be found for free at http://redseasfire.com/
If you want to hear some cool riffs and perfect technique while checking if you have a better time getting into it than I did, his Scenic Album is on Bandcamp:
The only song DSHS have released so far with Paul Green on vocals is Time and you can find it here:
The second main stage headliner was an old favorite of mine, the French tech-death masters Gorod!
I got into the band back in 2006 when they released Leading Vision so it made me very happy that they played four songs from that landmark album but their discography is so consistent that I think they could have played anything and people would have loved it.
Their only album I could find on Bandcamp is Process of a New Decline and while it's not their newest one you should listen to all their stuff anyway so that's as good a starting point as any:
*unless otherwise noted all pictures are taken by me