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Automatic extraction of features from harmonic information of music audio is considered in this paper. Automatically obtaining of relevant information is necessary not just for analysis but also for the commercial issue such as music program of tutoring and generating of lead sheet. Two aspects of harmony are considered, chord and global key, facing the issue of the extraction problem by the algorithm of machine learning. Contribution here is to recognize chords in the music by the featuredoi:10.1155/2021/5590996 doaj:9ba106c1c5a54b199b6fbfd7e8ae9845 fatcat:gozqak77mbdb5lugep25mbjfuu