[Following last week's release of NPD's October North American sales figures, EEDAR's director of analytical services Jesse Divnich presents his Gamasutra-exclusive study of October's hardware and software trends. In this analysis, Divnich speculates that the music and rhythm game "fad" has already reached its peak, as the number of genre titles balloon and Guitar Hero World Tour sales show a 60 percent drop over the previous main game in the series. Previously: Predictions on November's ...