(1) A version of a piece of music for resources other than those originally intended. This may be an instrumental version of a vocal number, a piano reduction of an orchestral piece, or may involve altering other parameters of the original, such as its harmony, rhythm, or structure.
(2) In sequencers, a term sometimes used for the general layout of tracks, channels, and patches, rather than a complete song. This template can often be saved as a separate file.