Groups of musicians, often referred to as bands, are collections of individuals who come together to create music. Bands typically consist of a vocalist, a drummer, a bassist, and one or more guitarists, but can also include other instrumentalists such as keyboardists, percussionists, and horn players. Bands have been around for centuries, with some of the earliest known bands being formed in the 18th century. Today, bands are popular in many genres of music, from rock and pop to jazz and classical.