Patent ID: 8912421

Claim:
A chord-playing instruction device comprising: a chord-information storage for storing, for each chord type, chord-type information of a chord and relationship information indicating relationship between a plurality of constituent notes including a tonic of the chord, as a set of chord information; a display controller for causing a display to show a plurality of music-playing operators arranged sequentially; a first instruction display for reading out a corresponding set of chord information stored in the chord-information storage when a tonic of a chord is specified, and then causing the display to show relationship information related to a constituent note other than the tonic, included in the read-out set of chord information, chord-type information of the chord, and an indicator that indicates a positional relationship between the tonic and a constituent note other than the tonic on the shown music-playing operators, based on a position of the specified tonic; and a second instruction display for extracting a set of chord information including relationship information that matches with relationship between the specified tonic and each of all notes specified subsequently to the tonic, from the chord-information storage, when a different note is specified after specification of the tonic, and causing the display to show relationship information related to a constituent note other than the specified notes, included in the extracted set of chord information, chord-type information of the chord, and an indicator that indicates a positional relationship between the tonic and a constituent note other than the specified constituent notes on the shown music-playing operators, based on a position of the specified tonic.