Guitar Hero is truly a classic, it has surpassed the boundaries of DanceDanceRevolution and all the old rhythm games.
There are four difficulties in Guitar Hero, and the difficulty curve is superb. Easy uses the first three buttons, medium the first four, and hard and expert use all five but vary in difficulty. The difficulty curve is made even better via the extensive set of tutorials which will help you with everything you need to know about Guitar Hero.
The games of guitar hero have awesome rock music that cover a wide span of ages with alot of variety. This game is insanely fun and you will play it for a long time before you get bored of it. If you haven't played this game already, you will enjoy it.