I've actually seen all of my favorite bands live but one...
Shows I've seen: Symphony X, Dream Theater, Sonata Arctica, Liquid Tension Experiment, Andy Timmons Band, Steve Vai, G3, Porcupine Tree, Three, Dio, Iron Maiden, Megadeth, Kamelot, Jordan Rudess, Blackfield, Joe Satriani....
The only bands I've yet to see out of the ones I really wanna go to are impossibilities really.
1. Guns N Roses (original band - obviously theyre dead as a band and Axl cant really sing anymore anyway)
2. Savatage (Criss is gone
, and apparently theres no reunion of any sort planned).
3. Ayreon (this is one that is probably even less likely than GNR getting back together...the amount of people Arjen would have to get together for this tour from like dozens of bands all over the world....but this is probably the one I'd want to see the most).