The welcoming party for the first DJ Hero DLC mixes wasn't entirely welcoming. Heck, they were carrying torches, pitchforks, and the like. I think one of them might've even scowled for a second there.
Up now for download, the "David Guetta Mix Pack 01" can be found on PlayStation Network and the Xbox LIVE Marketplace for $7.99 or 640 points, in Microsoft terms. Quite pricey, but you are getting three mixes. Three mixes that, to me anyway, aren't terribly appealing.
The other two videos for these songs can be found by clicking through the break. I was initially reluctant to be the bearer of this news, but then I found this creepy in-game character that made me so glad I did. Also, Wii players: we were told these mixes plus the debut ones are available for 300 points each.