Song in My Head

Sometimes, I get a song in my head that won't leave; Val gets this situation/condition frequently, and unfortunately for her, often it is a really hideous song.
Since last night, I have had a song in my head constantly, and while it is a really good song, I realize that there are reasons beyond it being a good song that I have it upstairs. The song is "Sidewalks of the City," by Lucinda Williams, off her amazing and I think fair to say legendary "Sweet Old World" CD.
Hopefully, I won't have to delve too far into that song and its meaning.