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During E3 we spoke with third-party peripheral manufacturer Nyko about its line of FrontMan guitars and which games the different versions were compatible with. We did a quick and dirty post on what we were told during the E3 madness, but Nyko just sent over the chart above, which, admittedly, is much easier to understand.
For first-party guitar compatibility, check out our Guitar Hero / Rock Band guitar compatibility matrix v2. We're sure to have v3 available as soon as we confirm Rock Band 2, Guitar Hero: World Tour and Rock Revolution guitar compatibility.