I love this song, it's called "Behind the Door" by Sixth Finger. I love the song, but I have no clue as to what it really means.
Here's a link to the song, just in case: http://www.youtube.com/watch?v=5y3OXssV34M
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I listened to the song, and I googled the lyric, and as far as I can tell it means exactly what it says: someone is nearby, with only a door separating them from you.