A ghostwriter is a person hired to write literary or journalistic works, speeches, or other texts that are putatively credited to another person as the author. Celebrities, executives, participants in timely news stories, and political leaders often hire ghostwriters to draft or edit autobiographies, memoirs, magazine articles, or other written material. Memoir ghostwriters often pride themselves in "disappearing" when impersonating others since such disappearance signals the quality of their craftsmanship. In music, ghostwriters are often used to write songs, lyrics, and instrumental pieces. Screenplay authors can also use ghostwriters to either edit or rewrite their scripts to improve them. Usually, there is a confidentiality clause in the contract between the ghostwriter and the credited author (or publisher) that obligates the former to remain anonymous, or obligates the later to not reveal the ghostwriter. Sometimes the ghostwriter is acknowledged by the author or publisher for their writing services, euphemistically called a "researcher" or "research assistant", but often the ghostwriter is not credited. Ghostwriting (or simply "ghosting") also occurs in other creative fields. Composers have long hired ghostwriters to help them to write musical pieces and songs; Wolfgang Amadeus Mozart is an example of a well-known composer who was paid to ghostwrite music for wealthy patrons. Ghosting also occurs in popular music. A pop music ghostwriter writes lyrics and a melody in the style of the credited musician. However it is most notable today among rap artists since there is a pressure to produce lyrically challenging content. Notable rappers such as Nicki Minaj have criticized artists like Cardi B for using ghostwriters to make their songs. In hip hop music, the increasing use of ghostwriters by high-profile hip-hop stars has led to controversy. In the visual arts, it is not uncommon in either fine art or commercial art such as comics for a number of assistants to do work on a piece that is credited to a single artist; Andy Warhol engaged in this practice, supervising an assembly line silk screen process for his artwork. However, when credit is established for the writer, the acknowledgment of their contribution is public domain and the writer in question would not be considered a ghostwriter. Source: Wikipedia (en)