Dream Theater is the perfect marriage of prog rock and heavy metal. If you've never heard the group, a good starting place is "The Big Medley" from their 1995 EP A Change of Seasons. It somehow combines Pink Floyd's "In the Flesh," Kansas' "Carry On Wayward Son," Queen's "Bohemian Rhapsody" and "Turn It On Again" by Genesis. It's a tough thing to pull off, but they do it with ease. That's not to imply Dream Theater is a cover band. The group has 11 studio albums, dating all the way back to 1989. Drummer Mike Portnoy left the band last year, but guitar great John Petrucci remains, and the band is still extremely active.
As we noted earlier, Dream Theater tweeted this poll to their fans, which helps explain why they ranked so high.