Dear Papa Bear,
I just turned 23 on July 27th! Here's my question: I'm not a huge fan of Iron Maiden, but being a Christian, I decided to do some research and I found out that not only is their drummer a Christian (for real!), but their song "Rime Of The Ancient Mariner" is a Christian song ... allegorical it may be! So, since I enjoy a variety of music, how do you know which rock/metal - or other genres - bands to listen to and which ones are just plain trashy like Slipknot?
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If you mean how do you tell by the lyrics, then the simplest thing to do is go to a website that posts music lyrics, the most obvious one being lyrics.com. Sometimes, it can be hard to tell just by lyrics, though, especially when you get some very poetic or symbolic or abstruse or, as in the case you cite, allegorical lyrics that are difficult to understand. Often, lyrics are very personal to the artist, self-referential, and hard to get unless you know the artist well.
If you're truly concerned as to whether a song is "Christian" enough for you, there are plenty of Christian rock bands you can listen to, as well as plain ol' church music. GodTube.com lists what it considers the 20 best Christian rock bands here.
As for mainstream rock, pop, and other genres, my thought is that you shouldn't worry about it. Just listen to what you enjoy. If you are a Christian in your heart, accidentally listening to some "bad" music is not going to make you turn Satanic. Music is to be enjoyed, not analyzed.
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