Automatic composition apparatus, automatic composition method and storage medium

An automatic composition method of an automatic composition apparatus including a processing unit, the automatic composition method performed by the processing unit comprising:

• performing pitch shift on pitches of individual note data items included in an input phrase;
• calculating a matching level between a phrase including note data items subjected to the pitch shift and a designated chord progression data item, with reference to a plurality of note connection rules each of which defines a connection relation of consecutive note types, if the pitch shift is performed;
• and
• generating a melody based on the phrase which includes the note data items subjected to the pitch shift and which is selected based on the calculated matching level.

A non-transitory storage medium storing a program which causes an automatic composition apparatus to perform following processes:

• performing pitch shift on pitches of individual note data items included in an input phrase;
• calculating a matching level between a phrase including note data items subjected to the pitch shift and a designated chord progression data item, with reference to a plurality of note connection rules each of which defines a connection relation of consecutive note types, if the pitch shift is performed;
• and
• generating a melody based on the phrase which includes the note data items subjected to the pitch shift and which is selected based on the calculated matching level.