Let's try something here. I'm collecting songs that have to do with one or more of the Seven Deadlies: you know, pride, lust, gluttony, sloth, wrath, greed and envy. How a song's about them doesn't matter too much, whether it's bleeding obvious, or a lot more subtle, or even preaching against them, so long as there's a connection. (But don't get too blatant when it comes to...that one. Capiche?)
Here's a couple examples for each I got going through my collection:
Pride
Fixing a Hole - The Beatles
Cult of Personality - Living Colour
Lust
Pictures of Lily - The Who
I Want You (She's So Heavy) - The Beatles
Gluttony
Never Enough - Dream Theater
The Card Cheat - The Clash
Sloth
Nowhere Man - The Beatles
January 1979 - mewithoutYou
Wrath
Us and Them - Pink Floyd
Everybody Wants to Rule the World - Tears for Fears
Envy
I Wouldn't Want to Be Like You - Alan Parsons Project
Mr. Brightside - The Killers
Greed
I Want It All - Queen
Want It All Back - Yoko Kanno