Do you have anything to support this? Guitar Hero 1 and 2 were a year apart on the PS2 and I can't find sales data that shows what you're claiming. Besides, that was for a year difference in the release dates...not 6 months.
I can't see people running out to buy another full price game so quickly just for more songs, especially when GH3 promises dozens of songs to play.
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Do you have anything to support this? Guitar Hero 1 and 2 were a year apart on the PS2 and I can't find sales data that shows what you're claiming. Besides, that was for a year difference in the release dates...not 6 months.
I can't see people running out to buy another full price game so quickly just for more songs, especially when GH3 promises dozens of songs to play.