An electronic musical score device is disclosed. An audio unit is provided for receiving a sound signal. An audio recognition unit performs an audio frequency recognition process to the sound signal to obtain a recognized musical note. A microprocessor unit receives musical score data with a plurality of standard musical notes and at least one recognized musical note and compares the recognized musical note with the plurality of standard musical notes to find a corresponding position for the recognized musical note in the music score data, wherein the music score data is capable of segmentation into at least one page. A display unit displays at least one page of the musical score data, wherein when the recognized musical note is located at a predetermined position in at least one page of the music score data, the microprocessor unit displays another page of the musical score data.