Tap has evolved as an American dance form, popularised throughout the world, with debate about its origins coming from African dance, Irish dance and/or clog dancing. The dancer uses their feet to strike the floor, beating out different rhythms, with dancers wearing tap shoes which have small metal plates on the toe and heel to give the distinctive sound. Tap dance is a theatrical art form often seen on stage in musicals but there are two major variations on tap dance exist: rhythm (jazz) tap and Broadway tap. Broadway tap focuses on dance; it is widely performed in musical theatre. Rhythm tap focuses on musicality, and practitioners consider themselves to be a part of the Jazz tradition.