Though not exactly Professional I do belong to a group that do get paid. What we sing is all a capella. We occasionally get the key screwed up at the start of a song, when we do that there is no point in going on, as it only gets worse. We were really bothered about it in the beginning but as time progressed and our confidence level increased we realized that it was just one of those things. All that I do now whenever that happens is make a joke about "well you have seen those guys up here with guitars forever tuning them, well we are just doing the same thing" No one has thrown anything at us, YET. JohnB