ocr: PTT HE "r four-line octave vint rf rer : P" - Pr b" G - TFr - rr a three-line octave PPT Jr Fr 4 C - -a" rr - two-line octave rr E - - - : one-line octave - - - - de - CI - a Middle C a ll 2 G - small octave octave - - - B great - - B, - - - D; Fr G. E, contraoctave B. - subcontraoctave