Abstract: An electronic musical instrument capable of performing an automatic accompaniment contains at least a tempo clock generator, a pattern memory, a manipulating section and a tone generator. The manipulating section includes at least a rhythm selecting switch for selecting a rhythm kind and a tempo speed control switch which controls the tempo clock generator to thereby change a tempo speed. The pattern memory stores a plurality of tone data each representative of a tone color and a plurality of pattern data each representative of a performance pattern. The tempo speed is divided into three speed areas. The tone data and pattern data are sequentially read from the pattern memory based on the selected rhythm kind and each speed area. Based on such read tone data and pattern data, the tone generator generates a musical tone signal by which desirable musical tones are to be generated.