I know this is kind of a touchy issue, so I'll try and tread lightly while keeping it brief. I know there have been studies done showing that listening to types certain music (particularly "dance" music) apparently triggers a release of endorphines into the bloodstream. Some critics from a Christian perspective claim this produces a sort of high or rush within the listener. My take is a simpler one. When you're listening to a certain type of music, even an individual song, where does it take you? Is it pulling you away from the Lord- despite what may be good lyrics? (By the way, I'm not suggesting we never listen to "secular" music.) Let's be honest here. You may be listening to someone quoting bible verses, but if the backdrop is more like the kind of thing you danced to in the clubs back in the day then it's likely not encouraging you toward Christ. In fact, the message is probably getting lost in the beat.
I'll tell you a little story. Several years ago I was riding in the car of a new friend/aquaintance who also said he was a follower of Christ. He also happened to be a musician. He said he wanted me to hear a certain recording he had in his car's CD player. It turned out to be some pretty vulgar stuff, and I was just unable to listen to it. When I questioned my friend as to why he would listen to such music he said he really didn't pay attention to the lyrics (!) and was only listening for the music and production values. I was flabbergasted!
To sum up, I believe everything we take in affects us. Scripture says we're to guard our hearts. So let's give thanks for and enjoy the freedom we have in Christ, but let's also use it with wisdom and discretion and not make provision for the flesh.