So I've been listening to Alt-J since a little before ACL Fest, and ever since I saw them, I've been listening to them even more. Their sound is just sort of different, and it's been sticking in my brain. I can't shake them loose.
They were featured on World Cafe today on NPR. You can check that appearance out here.
Here's a video for their song, Tesselate. I don't think it's necessarily their most unique-sounding tune, but it's pretty cool, and I like this video.