Should've said, listeners too - even more relevant! Yes, I know what you mean, and I think it's a fine line. I only sing songs that I feel something strongly for, so I want to express that - and yet also not tell the audience what to feel or over-do it. I once did a theatre course based on a whole school of thought around that - that one's performance should be fairly neutral, so that you're not doing the work for the audience.
Guess I'll figure it out for myself with practice...