120 HOME : VTAB 6: PRINT " THIS DEMONSTRATION PROGRAM WILL DISCUSS": PRINT "AND ILLUSTRATE VARIOUS USES OF HARMONY": PRINT
130 PRINT "AS IT APPLIES TO THE 'SOUND' PROGRAM.": PRINT : PRINT : PRINT " THE DISCUSSION WILL BEGIN WITH THE": PRINT : PRINT "LARGEST INTERVAL, THE FOURTH, AND": PRINT : PRINT "PROGRESS ON TO SUCCESSIVELY SMALLER": PRINT
140 PRINT "INTERVALS.": GOSUB 570
150 HOME : VTAB 3: PRINT " AROUND THE FIFTH CENTURY, A FORM OF": PRINT : PRINT "MUSIC KNOWN AS ORGANUM (ALSO CALLED": PRINT : PRINT "PLAIN SONG OR GREGORIAN CHANT) EMERGED.": PRINT
160 PRINT "ORGANUM USED PARALLEL OCTAVES, FIFTHS": PRINT : PRINT "AND FOURTHS TO HARMONIZE MODAL MELODIES.": PRINT : PRINT " MUSICIANS IN LATER ERAS TENDED TO AVOID"
170 PRINT "THESE INTERVALS BECAUSE IT SOUNDED TOO": PRINT : PRINT "MUCH LIKE CHURCH MUSIC.": GOSUB 570
180 HOME : VTAB 3: PRINT " THEREFORE, FOURTHS WILL BE OF LIMITED": PRINT : PRINT "VALUE TO YOU WHEN HARMONIZING MOST": PRINT : PRINT "MUSIC. ALTHOUGH, IT CAN BE USED WHEN": PRINT : PRINT "A MEDIEVAL CHURCH MUSIC FEEL IS DESIRED.": PRINT
190 PRINT : PRINT " PRESS RETURN TO HEAR A DEMONSTRATION": PRINT : PRINT "OF MUSIC HARMONIZED WITH PARALLEL": PRINT : PRINT "FOURTHS."
200 GOSUB 570: GOSUB 660
210 HOME : VTAB 3: PRINT "THE MOST USEFUL INTERVALS AVAILABLE TO": PRINT : PRINT "YOU ARE THOSE OF MAJOR AND MINOR THIRDS."
220 PRINT " A 'C' MAJOR SCALE CONSTRUCTED OUT OF": PRINT : PRINT "THIRDS WOULD BE AS FOLLOWS:": PRINT
230 PRINT "BASE LETTER PITCH": REM 12 SPACES
240 PRINT "NOTE INTERVAL NAMES VALUES": REM 2 SPACES BETWEEN TITLES
250 PRINT " C MAJOR 3RD C E 240,192": REM 3 SPACES BETWEEN COLUMNS
260 PRINT " D MINOR 3RD D F 216,180"
270 PRINT " E MINOR 3RD E G 192,160"
280 PRINT " F MAJOR 3RD F A 180,144"
290 PRINT " G MAJOR 3RD G B 160,128"
300 PRINT " A MINOR 3RD A C' 144,120"
310 PRINT " B MINOR 3RD B D' 126,105"
320 PRINT " C' MAJOR 3RD C'E' 120,96"
330 GOSUB 570
340 HOME : VTAB 3: PRINT " A SCALE MADE UP OF THIRDS IS FAIRLY IN": PRINT : PRINT "TUNE WITHIN THE FIRST OCTAVE.": GOSUB 660
350 PRINT : PRINT "...BUT THE SECOND OCTAVE IS NOT.": GOSUB 660
360 PRINT : PRINT : PRINT " TO AVOID THESE INTERVALS, EITHER": PRINT : PRINT "HARMONIZE WITH THE FIRST OCTAVE ONLY,": PRINT : PRINT "OR BE CAREFUL TO HARMONIZE AROUND THE": PRINT : PRINT "BAD INTERVALS IN THE SECOND OCTAVE.": GOSUB 570
370 HOME : VTAB 3: PRINT " INTERVALS OF SECONDS MAY BE USED IN": PRINT : PRINT "MANY WAYS. THE MOST USEFUL OF THESE IS": PRINT : PRINT "AS A DOMINANT SEVENTH CHORD.": PRINT
380 PRINT : PRINT "THE DOMINANT 7TH CHORD IS BUILT UPON THE": PRINT "FIFTH SCALE DEGREE. IN THE KEY OF 'C'": PRINT
390 PRINT "THAT WOULD BE THE NOTE 'G'. THE G 7TH": PRINT : PRINT "CHORD IS SPELLED G-B-D-F. TO SUGGEST THE": PRINT "DOMINANT 7TH CHORD USE THE ROOT AND THE": PRINT
400 PRINT "7TH, (IE. F-G).": GOSUB 570
410 HOME : VTAB 3: PRINT " THE 7TH IS USUALLY APPROACHED AND": PRINT : PRINT "RESOLVED IN STEPWISE MOTION.": PRINT : PRINT " FOLLOWING ARE THREE EXAMPLES OF HOW TO": PRINT : PRINT "USE THE DOMINANT 7TH CHORD."
430 HOME : VTAB 3: PRINT " THERE IS ONE OTHER DEVICE THAT IS": PRINT : PRINT "AVAILABLE TO YOU, THE FAN. IT IS CALLED": PRINT : PRINT "A FAN BECAUSE THE NOTES SLOWLY MOVE": PRINT : PRINT "APART LIKE A FAN BEING UNFOLDED.": PRINT
440 PRINT " FANS CAN BE EITHER OBLIQUE (IE. ONE": PRINT : PRINT "NOTE MOVES WHILE THE OTHER STAYS THE": PRINT : PRINT "SAME) OR CONTRARY (IE. BOTH NOTES MOVE": PRINT : PRINT "APART)."
450 PRINT : PRINT " FOLLOWING ARE SEVERAL EXAMPLES OF FANS.": GOSUB 570
500 HOME : VTAB 3: PRINT " THE FINAL SELECTION IS A FOLK SONG": PRINT : PRINT "ENTITLED 'THE BLUE TAIL FLY'. MOST OF": PRINT : PRINT "THIS SONG IS HARMONIZED IN THIRDS.": PRINT
510 PRINT "ONLY TWO SECONDS WERE USED IN THIS SONG,": PRINT "AND THEY WERE USED AS DOMINANT 7THS.": GOSUB 570: GOSUB 660
520 HTAB 2: VTAB 14: PRINT "SEE HOW SIMPLE IT IS?": PRINT : PRINT "NOW IT'S YOUR TURN TO EXPERIMENT AND": PRINT : PRINT "EXPLORE THE NEW WORLD OF HARMONY ON": PRINT : PRINT "THE APPLE."
530 END
540 REM *******************
550 REM * CONTINUE SUBRTN *
560 REM *******************
570 POKE -16368,0: REM STROBE. CLEAR KBD BUFFER
580 HTAB 7: VTAB 23: PRINT "PRESS <RETURN> TO CONTINUE"
