Automatic arrangement apparatus for converting pitches of musical information according to a tone progression and prohibition rules

摘要

In an automatic arrangement apparatus having an accompaniment information memory for memorizing an accompaniment pattern, a specific basic part such as a melody part for arrangement of a musical tune, a chord progression and an arrangement condition are applied to select an accompaniment pattern conformed with the arrangement condition from the accompaniment information memory thereby to produce musical information in the form of a pattern sequence of plural parts relative to the basic part, and the pattern sequence of the plural parts is converted in tone pitch in accordance with the chord progression. In the automatic arrangement apparatus, a tone resulting in an inappropriate tone pitch difference for the arrangement of the musical tune is prohibited under a first prohibition rule related to a relationship between the plural pares, and a tone resulting in an inappropriate chord progression for the arrangement of the musical tune is prohibited under a second prohibition rule related to the chord progression. The musical information is corrected to appropriate musical information for the arrangement of the musical tune if the tone prohibited under the prohibition rules is included therein.