Eh I wanted to add a little more to those who many don't have any idea what i'm talking about, so here is the short version:
1) The object of guitar hero is much like Dance Dance Revolution, you have to hit a coloured marker at the right time, how ever this is complicated by having to strum on the fake guitar as well.
This is the controller.
"Frets(colourd buttons)" a Bar to strum as if you're playing the strings, 'wammy bar(tremmolo)', those are the parts the matter. You have to strum and strike the write colour at the exact right time.
Seems pretty easy? Well after you get the hang of it is, however there is a demon bastard child out there on this game, that I just cannot seem to get better than 3 stars. It's a song by Buckethead called Jordan, below is a video for you to now understand my frustration.
For those of you who didn't need the explanation, and know exactly what i'm talking aobut, sit back, watch the video, and relieve the pain as this guy absolutely destroys this song, but it's still not 100%.
Enjoy, Jon :