When it comes to a live performance they say that the singer can make or break the performance but when you think about it, there is another external factor that must be considered, the PA System. If the PA system is not engineered correctly or if the operator doesn’t know what their doing the fidelity of the singer can become distorted. If the amplifier is too loud then even a perfectly sung piece can be ear piercing and could make people uncomfortable. If it’s too low you may not be able to hear them thus rendering their singing straining to the ears. Too much static can also ruin a performance.