clipped from en.wikipedia.org

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, such alterations became more common. In those decades the experimental genre of musique concrète used tape loops of music and environmental sounds to create sound compositions that were the forerunners of electronic music. 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.