
A backing track is an audio or MIDI recording that musicians play or sing along to in order to add parts to their music which would be impractical to perform live. ==Uses== Bands or solo musicians may use backing tracks to add extra instrumental or vocal tracks to a live performance, to enhance the sound (as in the employment of doubled backing vo...
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http://en.wikipedia.org/wiki/Backing_track

The basic instrumentation of a song to which vocals and overdubs will be added. When artists mime their performances (as in Top of the Pops of yore) or when you get up and embarrass yourself in front of a Karaoke machine, you're doing it to a backing track.
Found on
http://www.bbc.co.uk/radio2/soldonsong/glossary/b.shtml

Prerecorded accompaniment for a singer or voiceover actor who then listens through headphones to a replay as he/she performs. Generally, the two signals are ultimately mixed to produce the final recording. (Post Production)
Found on
http://www.filmland.com/glossary/Dictionary.html#A
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