At Activision’s unofficial E3 press conference Tuesday evening, one of the developers of this fall’s “Guitar Hero: World Tour” made a quick comment to the crowd about the new “GH” game being compatible with non-”GH” instruments.

Later, I asked for clarification.

Two Activision representatives confirmed that the age of cross-game instrument incompatibility is nearing its end.

They explained that the Xbox 360 version of “Guitar Hero: World Tour” will indeed be compatible with the instruments for the first “Rock Band.” The “GH” developers have, for obvious reasons, not been able to test their new game with the upcoming “Rock Band 2.” Other third-party guitar and drum controllers are expected to work with “GH: World Tour” as well.