Well, a good list of Dream Theater songs:
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And finally, last but not least,
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Finally, I'll sum this up by saying, Dream Theater is not for those with a short attention span, and all of their songs require and indefinite amount of listens as you are bound to gain new appreciation and rediscovery with each listen. You are also bound to miss parts that simply shouldn't be missed as they spew pure amazingness. Behold, the majesty that is Dream Theater. (This is a short list).