Which difficulty can you do on Full-combo (not miss a note) on guitar hero game?

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Hey all guitar hero players and heroes (of course :P)! Which difficulty can you master and make the whole song without missing a note? Tell us its name, so we can try to compete with your skills! I'm presonally playing the pc version of guitar hero games. I've played Guitar hero 3 and Guitar hero world tour. I personally like Guitar hero world tour more. I have mastered Kent's song on expert and most of the songs on hard. Some of the songs are really impossible for me, but the most impossible I think if We three kings from guitar hero 3: legends of rock. Way too hard for me... I guess it is the same for most of the people! I'm now playing the free version of guitar hero - like game - fofix (frets on fire X). I use rock band theme and game really feels like real game. I like rocking out on my custom songs without paying crazy money. Also there are more songs, but I miss the multyplayer.