There's ALWAYS hope. I actually teach a choir in church and never give out auditions. I basically welcome EVERYBODY - whether somebody has musical sensitivity or none. What's important is the willingness to learn. I don't think somebody with no musical sensitivity is a failure. It's just something which the person was not exposed in. So then I encountered a girl who was melodically challenged. I didn't shock her with scales or vocalises right away. Neither did I ask her to sing alone! What I did was asked her to listen to others sing for 2 weeks. I exposed her to good music first. Then I asked her to follow what I sang. The rest is history. Since then, she has been the section leader of the choir.