If you've been scratching your head trying to figure out which plastic gaming instruments work with which music games (we took our own stab at awhile back), Harmonix has published an "official" Rock Band/Guitar Hero Instrument Compatibility Guide. The quotes around "official" are there because they can clearly highlight the upcoming Beatles Rock Band game but must neglect their competitor's Guitar Hero 5, at least until it releases (ostensibly it will be the same as World Tour). Anyway, if you're wondering which replacement drums or guitar will work with your favorite games, now you have a reasonably good source...
