Phoenix - Wolfgang Amadeus Phoenix. A lovely album, it seems I'm always finding something in there even though I'm at 60 listens since november (had the album since 2010 too but I recently got really into it). The lyrics aren't at the forefront and don't make much sense in a literal way so it's good while concentrating.
Daft Punk/Disney - Tron Soundtrack. Makes you feel damn epic. It's fairly concise as there are 2 or 3 musical movements that tend to come back through the album, and it flows nicely from one track to the next. Pop it in, next thing you know an hour passed. With a nice little break to jam on Derezzed mid-way through.
I tried listening to Brian Eno's music for airport but it feels just way to musacky for me. I'll be giving Boards of Canada or Sigur Ros a try though I don't really like to listen to music for the strict purpose of concentrating if I wouldn't listen to otherwise.