This is an excellent video by Paul Baloche, one of my favorite writer/leaders, as he talks about worship leadership and the claim that sometimes it's performance and not leadership.
I get that response from time to time and I tell people that if I'm performing for you then you need to ask me for a refund. I'm not a performer but listen to Paul say that there is a performance "element" of playing an instrument or singing. That's just inherent.
I like what he says about practicing your "craft" privately during the week. I do that as I go into the worship center to play through and think through the flow of worship. It's some of the sweetest times during my week as I sing through and imagine what God is going to do in that service.
So, do you think it's performance or worship leadership? I'm dying to know.