Wii Instruments are things such as, guitars, drums, bass, microphone, and I even saw a violin once as well! They are used in the famous games such as guitar hero, rock band, and the most famous Beatles Guitar Hero, songs and characters based off of the famous Beatles! All you do is just place the Wii remote controller in the spot in the instruments required, and then the instruments work! As for the microphone, that is extremely useful for the famous karaoke games made just for the Wii. So get your instruments today and rock out!