African-American dance has developed within African-American communities in everyday spaces, rather than in studios, schools, or companies. These dances are usually centered on folk and social dance practice, though performance dance often supplies complementary aspects to this. Placing great value on improvisation, these dances are characterized by ongoing change and development. There are a number of notable African-American modern dance companies using African-American cultural dance as an inspiration, among these are the Whitey's Lindy Hoppers, Alvin Ailey American Dance Theater, Dance Theatre of Harlem,and Katherine Dunham Company. Hollywood and Broadway have also provided opportunities for African-American artists to share their work and for the public to support them.