10 Months Ago, bkuchera@arstechnica.com (Ben Kuchera) from arstechnica.com says (in Patch: Rejoice, your Guitar Hero guitars now work on PS3 Rock Band) A new patch for Rock Band fixes some downloadable content... and adds support of Guitar Hero 3 peripherals. Awesome.

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And PS3 News from PS3News says (in Patch: Rock Band Guitar Fix and Song Export Utility to Arrive Thrusday!) This title update will also patch for the use of the Guitar Hero III Les Paul PS3 Controller with RB1 on the PS3. We're excited to release this, as controller compatibility is something we've been working towards for a long time. ...

20 Months Ago, GamesIndustry.biz says (in Harmonix: Activision blocking Rock Band guitar patch - GamesIndustry.biz) Harmonix: Activision blocking Rock Band guitar patch
 UK - Dec 12, 2007
However, when Rock Band was released, PS3 owners were unable to use the Les Paul guitar controller included with Guitar Hero III: Legends of Rock. Harmonix ...

And Shacknews says (in Rock Band PS3 Patch Adds Guitar Hero III Controller Support) Activision expressly prohibits the use of this Guitar Hero controller with any other game."

An update to the PlayStation 3 version of Harmonix's Rock Band will arrive later today, granting compatibility with the wireless Les Paul controller bundled in the PS3 version of Guitar Hero III...