Hi Jonin,
I given a few custom private lessons where I taught how to play some of the Dream Theater songs such as Erotomania, Misunderstood, Overture, and Pull Me Under.
Also, if you check out some of the lessons archives in the series: Jam Sessions - Rock Style I & II CD-ROMs, you'll find many progressive ideas being taught in the style of the guitarist from Dream Theater.
Let me know if you have any questions or if you would like to get one of the custom private lessons I listed above. Email me
here.
Thanks, Lyle