Usually you can tell what kind of voice they have when they do the first round of learning a new song. If their voice is off key, I will just cancel the action and forget about it. If they have a good voice, then I let them continue and it is more enjoyable when they have a good voice. Christopher Steel has an awesome voice and very deep and it does not bother me when he sings, especially when he sings to Agnes. But, yes, it can be very annoying, to say the least. Pam is right though, if they learn all of the songs, they will sing them one after the other and it is not too bad.