Dream Theater is one of those 'just under the surface' bands, as I like to say. Anyone whose bother to look even an inch past what they are told to like by the media has likely heard of Dream Theater. Those people also likely play Rock Band. Put two and two together.
If this is not true i am giong to be so mad, but thanks for the update
Im still trying to get in contact with alex lifeson of rush for the entire rush catalog, but it turns out that it would take me two hours to bike to his new house, and I dont have a car to drive the 15 minutes away from me, and i do not know if he will even be there
Although I wasn't honestly expecting (and still not really) the full catalog, I did see this as conceivably being something that DT would get into - but hearing about it as more than speculation is great. Would gladly take most anything I could get, and while the 10 minute limit is a hindrance here, there's still plenty of material to be had.
As for those who say DT is not a well-known band, their last two albums made it to the #19 and #6 spots in the Billboard Album top 200, and their chart positions in mainland Europe (they never really caught on in the UK, for some reason), Japan and Mexico have been even higher. Think of them what you will, but they're not an small, unknown band by any means, especially not outside of the US.
The full DT catalogue would be EPIC
The guys on Scorehero were talking about the apparent ten minute limit...they linked an article that mentioned the limit as twenty minutes. EDIT: Ignore that, they're wrong.
Also, in the developer quotes thread HMXEnosity said about any time limit: "We are committed to giving artists the same tools that Harmonix uses when authoring music. I want to make it clear that RBN Store songs (if authored to the fullest) will be of the same caliber of songs in the RB Music Store. More details to come later."
That to me indicates that a big name artist like DT would get the same treatment on the RBN store as in the regular store.
Here's the SH topic.