Nobody has touched on any of the DnB artists on the lineup and I think Donald should do one for High Contrast (I've already bugged him about this and he will eventually). I will go ahead and throw some info on the biggest dnb dj on the lineup.
Also known as The Executioner (I didn't know this until recently) and my best guess as to why he has this nickname is because he fucking KILLS (I prefer this explanation at least). Known for his djing skills more than production, he is quite a pleasure to catch. He usually drops a lot of tracks in a set because as soon as he lets a track drop he is already starting to mix in the next track. He is FAST on the decks and drops heavy hitting rollers.
In 1993, at the age of 15, he and Ant Miles formed as Origin Unknown and produced Valley of the Shadows and released it on his own RAM Recordings label. This track is a classic that is still heard today proving that Andy C has been a huge influence in the world of drum n bass for over 15 years.
He has won best dj a number of years at the Knowledge Awards, Drum n Bass Arena polls, and for DJ Magazine. He is able to take crowds on hard hitting journeys through the jungles of bass. He has a number of mixes that have been released over the years including his Nightlife Series (5 in total) that all showcase some of the top anthems in dnb mixed together flawlessly; Drum n Bass Arena mixes; Fabriclive 18 with Hype (also on the lineup this year); and there are COUNTLESS of live recordings from KISS, BBC, and live shows.
For a taste of what he will bring to Coachella's Pure Filth stage I suggest listening to any of the Nightlife series - Nightlife 5 was released October 2010. I can't post any live youtubes because I guarantee the mc's will get on your nerves (it's not as bad live and GQ may or may not be annoying at Coachella). I've caught Andy C a handful of times and a few of those times I have been BLOWN AWAY. The speed at which this man drops tunes is just amazing. I believe Coachella will be another set where he just blows me away.