we all have different views on this. I think you could be right, and you could be wrong. but its a free opinion
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and dream theater hasnt had much influence on people like Pink Floyd has because Pink Floyd im sure has been around longer and has made a bigger inpact in the music industry. Dream Theater does have some influence like with John Petrucci and his way to play a solo easier. But as you said "less infuence" you say they still had an influence which is right. Just not as much as Pink Floyd.