To get ahead, we present a public image which conveys what we want the world to see, while in reality our self talk conveys a very different picture to our own souls. I suggest that the medium is at least a part of the message. The medium that conveys our message, of itself, communicates something. That's a mixed message. That's another mixed message.
Christian musicians can very easily convey mixed messages.
This table gives some examples. Beware, of sending mixed messages. Our audience can become confused. To minimise this confusion, two things need to happen. People communicating the message need to carefully marry the medium and the message so that the communication is consistent and effective.