Having worked in the industry for a couple of decades allowed me to see over 450 concerts in my life. Yes, I said more than 450. I have stubs to about half of those, and have seen everyone from Led Zep to Prince to Gwar to Genesis to Traffic to Erasure... well, you get the idea.
The bands I have seen the most would be Iron Maiden, Pink Floyd, Judas Priest, Rush, and Bad Religion. The sad part is, I remember seeing AC/DC on the Back in Black tour for six dollars. SIX DOLLARS! And that was before corporate sponsorship of tours.
The revolution will not be televised!