DT have been influenced by dozens of bands at one time or another, so it’s impossible to list which bands did and didn’t influence DT. However, in a recent interview, Mike summed up the band as follows:
It’s kind of like taking Metallica, Rush and Pink Floyd and putting them into a microware and waiting ’til the thing exploded and what comes out is Dream Theater.
Queensryche, Yes and Genesis are also among the band’s biggest influences over the years.
For individual influences, see the “Members” section.