If I had one band to see with OG singer; Freddy Mercury and Queen. I was a fool as a child (defined by me as less than 25 yo). Few regrets in life- missing him is one.
That's my Mt Rushmore of vocalists. Based on the stuff I grew up listening to and being a big fan of. Of course, this isn't to take away anything from the one who arguably started it all, Mr Plant.