I will give an example. Some bands when you hear a live version of a song you are left thinking what the hell was that. A little bit of leeway with the instrumental part I can tolerate but when the singer is just terrible to me it makes me wonder what was going on when recording. If you suck that much live. For example I have Sirius in my car and listen to Ozzys boneyard a lot and they often play a live version of Nightrain G&R and it sucks. I mean like half way through it my ears start to bleed.