The Turkish music industry includes a number of fields, ranging from record companies to radio stations and community and state orchestras. Most of the major record companies are based in Istanbul's region of "Unkapanı" and they are represented by the "Turkish Phonographic Industry Society" (MÜ-YAP). The major record companies produce material by artists that have signed to one of their record labels, a brand name often associated with a particular genre or record producer. Record companies may also promote and market their artists, through advertising, public performances and concerts, and television appearances.