This patent is about special scale configurations for electronic keyboards and controls to select them. Currently most keyboards are tuned to a well-tempered chromatic scale. This patent presents several alternate scales which can be selected by the musician. These selectable scales include the major and minor diatonic basic and active scales, major and minor semi-diatonic basic and active scales, jazz basic and active scales among others. This patent extends to an electronic component for studio use that incorporates automatic chord recognition and alternate scale selection to produce more harmonious pitches for notes played on a keyboard. This patent also describes reed instruments such as the melodica and the accordion when capability to select alternate scales is added.

An information processing apparatus according to the present disclosure includes: an acquisition unit that acquires music information; an extraction unit that extracts a plurality of types of feature amounts from the music information acquired by the acquisition unit; and a generation unit that generates information in which the plurality of types of feature amounts extracted by the extraction unit is associated with predetermined identification information as music feature information to be used as learning data in composition processing using machine learning.

A chord processing device includes a memory storing instructions, and a processor configured to implement the stored instructions to execute a plurality of tasks, including: a receiving task that receives a first chord consisting of plural notes, an analysis task that determines whether the first chord c is a subject chord, and a converting task that, in a case where the analysis task determines that the first chord is the subject chord, converts the first chord into a second chord that relates to the first chord a case where the first chord satisfies a prescribed chord-related condition relating to the first and second chords, while not converting the first chord in a case where the first chord does not satisfy the prescribed chord-related condition.