i think a lot of their influence stuff is really just a nod to the bands they are influenced by. they are such good musicians its almost something to do to break the boredom of being so good i feel. they can "bite" linkin park, rush, slayer, u2, muse, tool, peter gabriel, the beatles, metallica, opeth, ragtime, classical, etc. etc. etc. etc.
a very wide array or other bands. it's not like creed where it;s like ok these guys are like pearl jam or whatever people used to say about them. one thing about dream theater, with the exception of the last cd, they don't have many songs that sound the same. i don't think you can say that about any other band, especially that popular and with such a long and successful career. none of their albums sound like either.