Music is a form of art and cultural expression that relies on sound. When you make music, you use instruments or vocals—or both—to express ideas and feelings. Making music relies on pitch, dynamics, and rhythm, which is what makes it different from speech or random sounds. With music, you can tell a story, declare your feelings, make a political statement, or simply create sounds that are enjoyable or artistic. Musicians can make music individually or in groups. The word "music" can also apply to the written symbols that guide musicians in playing instruments or vocals.