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Mirror canon
The mirror canon is a type of canon which involves the leading voice being played alongside its own inversion (i.e. upside-down). The realisation from the 'closed' (unrealised) form can be effected by placing the page in front of a mirror, thus upside down, and beginning with the already progressing first voice.
The Canon a 2 'Quaerendo invenietis' from Johann Sebastian Bach's ''A Musical Offering'', BWV 1079, is a fine example of the process. In its original closed form the alto clef and an upside-down bass clef indicate both the mirror procedure and the appropriate pitches of the voices for the purpose of realisation.〔Boyd, Malcolm. ''Oxford Composer Companions: J.S. Bach'', Oxford University Press, 1999, p. 296.〕
== See also ==
*Mirror fugue
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