I'm in the Detroit airport now. How did you find it weird, in relation to other airports? I think it's actually quite nice. Especially McNamara. Great Sky lounge, good restaurant options. -For an airport :-) Edit: Also, congrats on the job!!
I think the music is Brian Eno's "Music For Airports" famous piece that couldn't be used more appropriately. I always liked that tunnel. I'm a big fan of unusual airport stuff. There is an awesome kinetic sculpture in Boston's airport. Stuff like that breaks up the hideous banality of the experience.
Have you heard Eno's soundtrack he did for an Apollo documentary? I've been digging it lately: The track Silver Morning at 25:55 has some really nice slide guitar that he incorporates into these ambient tracks which definitely does it for me when it comes in kind of unexpectedly after the first half of the album.
Yeah, that tunnel is a trip..no doubt about it.