Construct a melodious and harmonious piece that emulates the essence of Bach's iconic works.  
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 | G E/D/ C G | A3/4B/8c/8 A !fermata!G G | A B c B | A/c/ B/A/ !fermata!G E | A G F E | %6
 D2 !fermata!C C | G E/D/ C G | A3/4B/8c/8 A !fermata!G G | A B c B | A/c/ B/A/ !fermata!G E | %11
 A G F E | D2 !fermata!C z | G2 !fermata!E2 | G2 !fermata!E2 | E E D D | E E D E | F E D2 | %18
 !fermata!C2 c B | A G F E | D2 !fermata!C z |] %21
V:2
 z3 G, | G, G, A, B, | E D !fermata!D E | F F E D/G/ | G ^F !fermata!D C | C C C/B,/ C | %6
 C B, !fermata!G, G, | G, G, A, B, | E D !fermata!D E | F F E D/G/ | G ^F !fermata!D C | %11
 C C C/B,/ C | C B, !fermata!G, z | D2 C2 | D2 !fermata!C2 | C C B, B, | C C B, ^C | %17
 D =C/B,/ A, B, | !fermata!G,2 E E/D/ | C/D/ E E/D/ D/C/ | C/B,/4A,/4 B, !fermata!G, z |] %21
V:3
 z3 E, | D, C,/D,/ E,/^F,/ G, | G, ^F, !fermata!B, C | C D G,/A,/ B, | E,/E/ D/C/ !fermata!B, G, | %5
 F, G, A,/F,/ G, | G,3/2 F,/ !fermata!E, E, | D, C,/D,/ E,/^F,/ G, | G, ^F, !fermata!B, C | %9
 C D G,/A,/ B, | E,/E/ D/C/ !fermata!B, G, | F, G, A,/F,/ G, | G,3/2 F,/ !fermata!E, z | G,2 G,2 | %14
 B,2 !fermata!G,2 | G, G, G, G, | G, G, G, G, | A,/B,/ C C/B,/4A,/4 G,/F,/ | %18
 !fermata!E,2 E,/^F,/ ^G, | A, B, C/D/ G, | A, G,/F,/ !fermata!E, z |] %21
V:4
 z3"C" C, |"G/B" B,,"C" C,/B,,/"Am" A,,"Em" E,/D,/ |"Am7/C" C,/A,,/"D" D,"G" !fermata!G,,"C" C, | %3
"F" F,"Bdim/E" E,/D,/"C/E" E,/^F,/"G" G, |"Am7/C" C,"Bm/D" D,"G" !fermata!G,,"C" C, | %5
"F" F,"C/E" E,"Dm7" D,"C" C, |"Gsus4" G,,2"C" !fermata!C,"C" C, | %7
"G/B" B,,"C" C,/B,,/"Am" A,,"Em" E,/D,/ |"Am7/C" C,/A,,/"D" D,"G" !fermata!G,,"C" C, | %9
"F" F,"Bdim/E" E,/D,/"C/E" E,/^F,/"G" G, |"Am7/C" C,"Bm/D" D,"G" !fermata!G,,"C" C, | %11
"F" F,"C/E" E,"Dm7" D,"C" C, |"Gsus4" G,,2"C" !fermata!C, z |"G/B" B,,2"C" !fermata!C,2 | %14
"G" G,,2"C" !fermata!C,2 |"C" C,/D,/"C/E" E,/F,/"G" G,/A,/"G" G,/F,/ | %16
"C/E" E,/D,/"C/E" E,/C,/"G" G,,/G,/"C#dim/F" F,/E,/ |"Dm" D,"Am" A,/G,/"Dm7/F" F,"G" G, | %18
"C" !fermata!C,2"Am" A,,"E" E,, |"F" F,,"Em/G" G,,"Fmaj7/A" A,,/B,,/"C" C, | %20
"Dm7/F" F,,"G" G,,"C" !fermata!C, z |] %21  