On the other hand, many inexperienced singers need a solid accompaniest to stay anywhere near the song's key or rhythm. As a result, musicians often try to bring the singer back, instead of going with his/her interpretation, even if they are perfectly capable of it. A new accompaniest isn't going to be necessarily be able to make the right choice unless you talk about it.

Of course, if you are poor on theory, they may think they know better; egos always come into play. And honestly, they might. But are you singing along with them or are they accompanying you?

People who break the "rules" on purpose are almost always more effective than those who break the rules because they never learned them.