Craft a melody reflecting the essence of Bach's musical repertoire.  
X:1
T:Music21 Fragment
T:Music21 Fragment
T:Music21
C:Music21
%%score 1 2 3 4
L:1/4
M:4/4
K:C
V:1 treble 
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:2 treble 
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:3 bass 
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:4 bass 
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:1
 z3 c | B A G F/E/ | A A !fermata!G c | B A G F/E/ | A A !fermata!G G | A B c/d/ e | d c2 B | %7
 !fermata!c3 c | B A G F/E/ | A A !fermata!G c | B A G F/E/ | A A !fermata!G G | A B c/d/ e | %13
 d c2 B | !fermata!c3 c | c d c/B/ A/B/ | c c !fermata!B B | c d c/B/ A/B/ | c/e/ d !fermata!B e | %19
 e e d c | c B !fermata!c B | c B A G | G ^F !fermata!G e | d c !fermata!B e | f/e/ d e c | %25
 c B !fermata!c c | c c d c | c3 B | !fermata!c3 z |] %29
V:2
 z3 G | G E E D/C/ | C F E E | E/D/ C/D/ E/D/ C/B,/ | C/D/ D E E | F/A/ G/F/ E/D/ C | D2 E F | %7
 E3 E | G E E D/C/ | C F E E | E/D/ C/D/ E/D/ C/B,/ | C/D/ D E E | F/A/ G/F/ E/D/ C | D2 E F | %14
 E3 E | F F E3/2 E/ | D/E/ ^F G G | G =F E F | G A G G | G A A F | E D E F | E D/G/ E E | E D D C | %23
 D/E/4F/4 E/^F/ ^G A | A ^G/A/ E E | _E/D/ D =E E | F F F E | D2 D2 | E3 z |] %29
V:3
 z3 E | D C B, _B, | A,/G,/ A,/=B,/ C E,/F,/ | G, A,/B,/ C F,/G,/ | A,/C/ B,/A,/ B, C | %5
 C/F/ E/D/ C/G,/ _B, | A,2 G,2 | G,3 E | D C B, _B, | A,/G,/ A,/=B,/ C E,/F,/ | %10
 G, A,/B,/ C F,/G,/ | A,/C/ B,/A,/ B, C | C/F/ E/D/ C/G,/ _B, | A,2 G,2 | G,3 G, | %15
 A, A, A,/B,/ C/B,/ | A, D D D | G, G, G, D | C/B,/ A, D C | C C D D | G, G, G, D | %21
 G,/A,/ B, C B, | C/B,/ A, B, G,/A,/ | B, C/A,/ E A, | D/C/ B,/A,/ B, A, | A, G, G, _B, | %26
 A,/=B,/ C G, G, | A,2 G,2 | G,3 z |] %29
V:4
 z3"C" C, |"G" G,"Am" A,"Em" E,"Gm7" G, |"F" F,"F" F,,"C" C,"Am" A,, | %3
"Em" E,"F" F,"C" C,/B,,/"F/A" A,,/G,,/ |"F" F,,"Bm7b5/F" F,"Em" E,"C" C, | %5
"F" F,"Em/G" G,"Am" A,/B,,/"C" C, |"Dm/F" F,,"D7/F#" ^F,,"C/G" G,,2 |"C" C,3"C" C, | %8
"G" G,"Am" A,"Em" E,"Gm7" G, |"F" F,"F" F,,"C" C,"Am" A,, |"Em" E,"F" F,"C" C,/B,,/"F/A" A,,/G,,/ | %11
"F" F,,"Bm7b5/F" F,"Em" E,"C" C, |"F" F,"Em/G" G,"Am" A,/B,,/"C" C, | %13
"Dm/F" F,,"D7/F#" ^F,,"C/G" G,,2 |"C" C,3"C" C, |"F" F,/E,/"Dm" D,"Am" A,,"Am" A,/G,/ | %16
"D7/F#" ^F,/E,/"D" D,"G" G,"G" G,/=F,/ |"C/E" E,/D,/"G7/B" C,/B,,/"C" C,"Dm" D, | %18
"C/E" E,"D/F#" ^F,"G" G,"C" C, |"C" C/B,/"Am" A,/G,/"Dm/F" =F,/G,/"Dm7/A" A,/F,/ | %20
"C/G" G,"G" G,,"C" C,"Bdim/D" D, |"C/E" E,/^F,/"G" G,/E,/"Am/C" C,/D,/"Em" E,/C,/ | %22
"Am7" A,,"D" D,"G" G,,"C" C, |"G" G,"Am" A,"E" E,"A/C#" ^C, | %24
"Dm" D,/E,/"G#dim7/F" F,"E/G#" ^G,,"Am" A,, |"F#dim7" ^F,"G" G,"C" C,"C" C, | %26
"F" F,/G,/"F/A" A,"G7/B" B,,"C" C, |"D7/F#" ^F,,2"G" G,,2 |"C" C,,3 z |] %29  