A signature song is the one song (or, in some cases, one of a few songs) that a popular and well-established singer or band is most closely identified with or best known for, even if they have had success with a variety of songs. Signature songs can be the result of spontaneous public identification and/or a marketing tool developed by the music industry to promote artists, sell their recordings, and develop a fan base.

A signature song is important for many artists. Bands with a signature song often choose to perform it at every concert appearance. Marketing programs by recording companies and fan expectations for these signature songs sometimes result in the artist's having difficulty performing other kinds of music. Two well-known examples of this phenomenon are Ricky Nelson's ill-treatment by his fans at Madison Square Garden in 1971 (see "Garden Party") and Merle Haggard's public fight with Capitol Records to release his tribute album of Bob Wills dance songs after the success of "Okie from Muskogee" in 1969.

Michael Joseph Jackson (August 29, 1958 – June 25, 2009) was an American recording artist, entertainer, and businessman. Often referred to as the King of Pop, or by his initials MJ, Jackson is recognized as the most successful entertainer of all time by Guinness World Records. His contribution to music, dance, and fashion, along with a much-publicized personal life, made him a global figure in popular culture for over four decades. The seventh child of the Jackson family, he debuted on the professional music scene along with his brothers as a member of The Jackson 5 in 1964, and began his solo career in 1971.

In the early 1980s, Jackson became a dominant figure in popular music. The music videos for his songs, including those of "Beat It", "Billie Jean", and "Thriller", were credited with transforming the medium into an art form and a promotional tool, and the popularity of these videos helped to bring the relatively new television channel MTV to fame. Videos such as "Black or White" and "Scream" made him a staple on MTV in the 1990s. Through stage performances and music videos, Jackson popularized a number of complicated dance techniques, such as the robot and the moonwalk, to which he gave the name. His distinctive musical sound and vocal style influenced numerous hip hop, post-disco, contemporary R&B, pop and rock artists.