Guitar hero is a game that let's you rock out to you're favorite songs and makes you feel like you're on stage. Of course it will never beat the real thing but for people who don't have time to learn a real instrument, this game will give you a good experience. If you don't know the game is based on trying to play notes as they come by on a moving track. You have five buttons corresponding to the five colored rings on screen. To hit a note simply hold down the corresponding button and then flick as the note comes buy to hit it. It sounds complicated for beginners but once you reach expert and start doing songs like dragonforce (which could be a long or short time depending on who you are, for me it took a few weeks) you will start to have a lot of fun. The game kept growing up popularity up to 3 and 4 and started to lose fans to 5.
As you may know, there are A LOT of guitar hero games, I have them all and can answer any questions about any of them. The games are: guitar hero 1, guitar hero 2, guitar hero 3, guitar hero world tour or 4, guitar hero 5, and the single band based games like guitar hero aerosmith, guitar hero...