'Guitar Freaks' and 'DrumMania' are basically two separate music games that are now linked together, on a single cd.

Basically, you're told how to play your instrument via a scrolling collection of bars. The longer you go without missing a note, the higher your score. Miss too many, and your game ends. At the end of every song, you're given a report card that tallies up your mistakes and gives you a letter grade based on your performance.