Patent ID: 8314320

Claim:
An automatic accompanying apparatus comprising: storing means for storing automatic accompanying data, wherein the automatic accompanying data includes at least chord names and tone producing timings of chord composing tones based on time information containing beats; musical-tone generating means for generating musical-tone data of a musical piece; musical-tone data controlling means for controlling the musical-tone generating means in response to manipulation of a performance device; and chord name determining means for determining a chord name for generating musical tones in accordance with the automatic accompanying data, based on manipulation of the performance device, wherein the chord name determining means further comprises: melody tone deciding means for deciding information of a current melody tone and information of a previous melody tone, based on time information for defining progression of the automatic accompanying data in operation in a melody sequence, which progresses in response to manipulation of the performance device, wherein the current melody tone relates a key depressed at a leading position of a current beat and the previous melody tone relates a key depressed at a leading position of a previous beat directly prior to the current beat; and chord name deciding means for deciding information of a current chord name based on the information of a current melody tone and the information of a previous melody tone, which have been decided by the melody tone deciding means, and information of a previous chord name at the previous beat, wherein the melody tone deciding means decides the information of a current melody tone and the information of a previous melody tone based on what number the current beat is in a measure.