I have not seen every band that I have ever wanted to live, but I did see Tool in a monsoon. I doubt I will ever see anything better in my life. Stone sober.
This is a great clip of a Tool show for those fans that have not been or those unaware. Every member of Tool is a freak of nature, but in a very good way.
Next best performance I have seen was Bad Religion. It was nothing spectacular like a Tool show, but they were the best sounding band I have seen live.