Music of all sorts can reach any number of people. For instance, my brother is in to the heavy metal / hardcore music (i.e. Metallica, KORN, Slipknot, etc.). A few years back, I found a band that fits into this genre - AND THEY ARE CHRISTIANS WITH CHRISTIAN LYRICS. Project 86 (look them up!), Underoath, Norma Jean, P.O.D., Pillar, and many more bands play this type of music and are clearly christians. Their message is able to be carried to different believers.
Now, pertaining to the current issue, if the cds are conflicting with your beliefs then break them up and throw them out, don't sell them.