Thought I'd offer my two cents.
As if it weren't evident enough considering I'm the one who added the dedicated tracks to my maps, I'm obviously for the "one song per map" approach. : ) (And, on that note, I'm glad it sparked conversation - it's just what we'd hope for given the in-theory community-driven nature of the project.)
Music in video games is immensely important to establishing character and atmosphere, just as much as the other [visual] artwork that's hopefully attributing towards the same goals.
Let me offer an example that hopefully illustrates my point. Everytime I hear
this song [youtube.com] (In case this video disappears at some point, it's of Unreal Tournament's DM-Phobos) in UT, I think of this map. Inversely, everytime I see a screenshot of the map, its music pops into my head; they complement each other so incredibly well that this is naturally the result. My hope is that the same could be done in our own Red Eclipse.
When I map in any engine, I often pick out the song first in fact (or a song that I think establishes a unique atmosphere [whether in the game or not], or conjures up some imagery in my mind that I can manifest visually in a level through architecture or what have you) and have that playing in the background as I work. Music is often my inspiration, and so for me they (the levels and their songs) are connected very intimately in many cases.
Also, I'm not entirely sure where people are coming from as far as tracks looping being an issue. Whether I'm playing Unreal Tournament or Sonic the Hedgehog (or any one of a million other games for that matter) I have one song playing as I progress through a stage... as I've said, if anything it adds to the experience, it doesn't detract from it to any degree. The songs we have to work with here are more or less seamless as well (they could be to a greater extent, but they're good enough, especially for now anyway), so that isn't an issue either. Perhaps someone can explain to me better the issue to which many of you are referring.
On a more off-topic note, I'm shocked as to how many people mute a video game's soundtrack in place of their own "background" music. To each their own of course, but it just goes to show how tastes can differ across such a wide spectrum (a spectrum in which I am apparently on one end to an extreme in a very small minority group : ) ).
Hopefully even in my work-induced sleep-deprived state I've articulated my points well enough to provide some insight to everyone and the conversation that's going on.
Happy voting folks.