A remix is an alternative version of a song, different from the original version. A remixer uses audio mixing to compose an alternate master recording of a song, adding or subtracting elements, or simply changing the equalization, dynamics, pitch, tempo, playing time, or almost any other aspect of the various musical components. Some remixes involve substantial changes to the arrangement of a recorded work, but many are subtle, such as creating a "vocal up" version of an album cut that emphasizes the lead singer's voice. A song may be remixed to give a song that was not popular a second chance at radio and club play, to create a stereo or surround sound version of a recording where none was previously available, to improve the fidelity of an older recording in which the original mixdown tape has been lost or degraded, or to alter a song to suit a specific music genre or radio format. Remixes should not be confused with edits, which usually involve shortening a final stereo master for marketing purposes.

Roots of the remix

Since the beginnings of recorded sound in the late 19th century, certain people have enjoyed the ability to rearrange the normal listening experience with technology. With the advent of easily editable magnetic tape in the 1940s and 1950s and the subsequent development of multitrack recording, such alterations became more common. In those decades the experimental genre of musique concrète used tape manipulation to create sound compositions. Less artistically lofty edits produced medleys or novelty recordings of various types.

Modern remixing had its roots in the dance hall culture of late-1960s/early-1970s Jamaica. The fluid evolution of music that encompassed ska, rocksteady, reggae and dub was embraced by local mixing wizards who deconstructed and rebuilt tracks to suit the tastes of their audience. Producers and engineers like Ruddy Redwood, King Tubby and Lee "Scratch" Perry popularized stripped-down instrumental mixes (which they called "versions") of reggae tunes. At first they simply dropped the vocal tracks, but soon more sophisticated effects were created, dropping separate instrumental tracks in and out of the mix, isolating and repeating hooks, and adding various effects like echo, reverberation and delay.

At the same time, DJs in early discotheques were performing similar tricks with disco songs (using loops and tape edits) to get dancers on the floor and keep them there. One noteworthy figure was Tom Moulton who invented the dance remix as we now know it. Though not a DJ (a popular misconception), Mr. Moulton had begun his career by making a home-made mix tape for a Fire Island dance club in the late 1960s. His tapes eventually became popular and he came to the attention of the music industry in New York City. At first Moulton was simply called upon to improve the aesthetics of dance-oriented recordings before release ("I didn't do the remix, I did the mix"—Tom Moulton). Eventually, he moved from being a "fix it" man on pop records to specializing in remixes for the dance floor. Along the way, he invented the breakdown section and the 12-inch single vinyl format. Walter Gibbons provided the dance version of the first commercial 12-inch single ("Ten Percent", by Double Exposure). Contrary to popular belief, Gibbons did not mix the record. In fact his version was a re-edit of the original mix. Moulton, Gibbons and their contemporaries (Jim Burgess, Tee Scott, and later Larry Levan and Shep Pettibone) at Salsoul Records proved to be the most influential group of remixers for the disco era. The Salsoul catalog is seen (especially in Great Britain and Europe) as being the "canon" for the disco mixer's art form. Pettibone is among a very small number of remixers whose work successfully transitioned from the Disco era to the House era. (He is certainly the most high profile remixer to do so.) His contemporaries included Arthur Baker and Francois Kevorkian.