Guitar Hero 2
Guitar Hero 2 (stylized as Guitar Hero II) is a rhythm game developed by Harmonix, published by Activision, and released in 2006 for the PlayStation 2 and 2007 for the Xbox 360. More general information is available on Wikipedia.
Differences between releases
The PlayStation 2 release and the Xbox 360 release have some differences, most notably more songs and the addition of DLC on the Xbox 360.
MOGG Files
The Xbox release uses Harmonix's MOGG File Format for audio, as opposed to the PS2's .VGS files.