Abstract: Methods and apparatus are disclosed which are utilized in providing a musical instrument useful for composing, teaching, learning and performing music. The instrument includes a pitch detector which responds to an applied input signal to produce and octave code representing the octave in which the input signal is located and a note code representing the note which is closest in pitch to the input signal. The octave and note codes are applied to display means which indicate the octave and note nearest in pitch to the input signal. The octave and note codes are also applied to an automatic pitch generator wherein they control the dividing down of a high frequency clock signal to produce a true pitch signal having the pitch corresponding to the octave and note codes. The automatic pitch generator also has provision for selectively combining octave and note transpose codes with the octave and note codes to achieve any desired degree of transposition of the true pitch signal.