Do all guitar game controllers work with all guitar games?

[Scooter]

In other words, will a Guitar Hero controller sold by Activision work with Rock Band games? Of course the GH and RB publishers aren't going to tell you their guitar controller will work with a competitors game and for all I know they build something into the controller or the game that prevents playing competitors' games.

The reason I ask is that I don't currently have any guitar games but I'm thinking of getting GH Aerosmith packed with a guitar yet Harmonix will be releasing a new game in Q4 of 2009 based on the Beatles and I absolutely will want to get that game but I sure don't want to have to buy another guitar controller at that time just to play the new game.

[PharmaceuticalCowboy]

Totally matters what system we're talking about. However, generally the GH III and I believe Aerosmith stuff isn't compatible with the RB stuff. I do also believe this has changed with World Tour and RB2 and now more stuff is compatible, specifically the guitar controllers.

[Scooter]

Specifically, this is for PS2. But now that I think about it, I doubt that a game slated for a Q4 2009 release will be released in PS2 format anyway. I'd suspect by then I'll have to buy a modern system (PS3, Xbox 360 or Wii) to be able to play the upcoming Beatles game.