A "four-piece" typically refers to a musical group consisting of four members. This configuration is common in various genres, including rock, jazz, and pop. Each member usually plays a different instrument or contributes in a unique way, such as vocals, guitar, bass, and drums. The combination allows for a rich and diverse sound. In addition to music, the term "four-piece" can also describe items sold as a set of four, such as a dinnerware set or a tool kit. This designation helps consumers understand the quantity and variety of items included in the package.