Another thing to think about, is if you play secular music, even though it may seem harmless enough, some of the people listening might recognize that song. For them it might bring back the wrong kind of memories, when they listened to all kinds of secular garbage.
Just a thought? I do think its better to NOT play secular music in a Christian set. Not even one second of it, because people know what that is, and they got tired of it. That’s why they are listening to a Christian DJ now, to hear something different….