The music industry is dominated by four major record labels that control most commercial music production and distribution. These major labels own smaller subsidiary labels in order to reach different audiences with various music genres. There are also many independent labels that focus on smaller numbers of artists within niche genres. Record labels are organized internally into areas like artists and repertoire, marketing, promotions, legal, and financial. Music videos serve to promote singles, albums, and artists through visually stylish presentations that entertain and influence popular culture while reinforcing or changing perceptions of songs.