A remix is an alternative version of a song,
different from the original version. A remixer uses audio mixing to
compose an alternate master 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
wasn't popular a second chance at radio and club play, 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.