John Petrucci tweeted last night about a new music application for the iOS platform (iPad, iPhone, and iPod Touch), as well as Mac. It is tentatively coming to Windows as a beta on May 25. You can visit the website here -
https://www.jammit.com/Essentially, it allows you to buy individual stems of a song and "mix" the volume levels during play (such as turn up or down individually the Guitar 1, Guitar 2, Band, Click, etc. if you buy the "Guitar" track). You can also view the sheet music for that track.
The only bad thing is the price. Most "tracks" (note: you have to buy the stems individually, so just guitar, bass, vocals, drums, or keys) cost between $3.99 and $5.99, and while you still get the song to listen to as the "Band" stem, I think it would make sense if you got every stem for that price.
About 90% of the songs currently in the store for Jammit are also in Guitar Hero or Rock Band (which makes sense, considering that the stems have already been procured for the games and are easily accessible).
Of course, two of Dream Theater's songs currently on the store are Pull Me Under (from Guitar Hero: World Tour) and Panic Attack (from Rock Band 2). However, there is a third one out of nowhere: These Walls. That has never been in a music game before.
I understand I could be reading into this too much, but DT tends to only make stems available for music games. Remember how we could download the OTBOA stems just a few weeks before it came to Rock Band?
I know most of you don't care about Rock Band anymore, but I just thought it was worth posting. The Jammit thing is pretty cool, but I can't see myself devoting much time to it with the amount of money it costs.