Bad Guys Wear Black is a line from a Pantera song. It's an apocalypse fic and in it, the bad guys do wear black, black is the colour of death/loss/things like that, so for the enemies to wear black to signify death, I thought, was an alright idea.
Echoes & Silence sounded almost...desperate, to me. If you read it, you'll understand, that Krist is desperate for Kurt to still be alive, calling for him - the "echo" and eventually realising he's gone, which is the "silence".
Glass Dream...seriously not sure how I thought it up. It's quite difficult to describe how he's feeling through the story, possibly that he feels trapped (the glass) and he uses dreams to escape. I don't know. It's pretty strange.
What Is Love? was the question Angus asked throughout the story, so I thought it would fit.
This November was the time the story is set in, during winter, so, it seemed appropriate.
The Evermore Song is called so because it relates to something that comes up later in the story. Bon writes a song, records it with all the band except Angus, since it's for him and he wants to keep it a surprise. But Angus doesn't find it until a long time later and he swears it'll remain with him forever, hence the "evermore song".