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Composers No known composers  |
  ,
the organum appeared in the 10th century, and the principle was doubling
cantus firmus
(the melodic line) at a fixed interval, a
fourth
or a fifth.
Organum was later improved into Discant,
where accompanying voices became freer in intervals and rhythm. Melodic
flow in Discant is similar, but not identical, to the original, as in the
traditional organum .
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