Abstract: An electronic musical instrument includes first and second ROM's addressable for producing respective two-bar musical patterns representing independent automatic rhythm and music style features. Both ROM's are operable in response to a common clock signal to facilitate synchronous operation thereof regardless of the order in which the two features are played. In particular, the states of a rhythm counter clocked by the clock signal are decoded for generating a first control code tracking the extent of completion of the two-bar automatic rhythm pattern, the first control code being used to initialize start-up of the music style pattern during a performance of the automatic rhythm feature to insure completion of the two musical patterns in time coincidence. Upon start-up of the automatic rhythm feature during a performance of the music style pattern, a second control code is calculated to initiate the automatic rhythm pattern to insure time coincidental completion of the two musical patterns.