Write a piece that resonates with the core elements of Bach's melodies.  
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
 E D C D | E/F/ G F2 | !fermata!E2 G E | F E/D/ C/D/ E | D2 !fermata!C2 | E D C D | E/F/ G F2 | %7
 !fermata!E2 G E | F E/D/ C/D/ E | D2 !fermata!C2 | G A/B/ c c | B/A/ G/A/ A2 | %12
 !fermata!G2 G A/B/ | c c B/A/ G/A/ | A2 !fermata!G2 | D E F F | E/G/ F/E/ D !fermata!D | %17
 G E F E/D/ | C/D/ E D2 | !fermata!C4 |] %20
V:2
 C B, A, G, | G, C2 B, | !fermata!C2 D C | C C/B,/ A,/B,/ C | C B, !fermata!G,2 | C B, A, G, | %6
 G, C2 B, | !fermata!C2 D C | C C/B,/ A,/B,/ C | C B, !fermata!G,2 | E D C/D/ E | E B, E D/C/ | %12
 !fermata!B,2 C C/D/ | E E D D/E/ | D/C/4B,/4 C !fermata!B,2 | B, C B,/C/ D | %16
 C/E/ D/C/ B, !fermata!B, | B, C3/2 B,/ C/B,/ | A,/B,/ C2 B, | !fermata!G,4 |] %20
V:3
 G, G,/F,/ E, D, | C,/D,/ E, D,/C,/ D, | !fermata!C,2 G, G, | A, G, A, G, | %4
 G,/F,/4E,/4 F, !fermata!E,2 | G, G,/F,/ E, D, | C,/D,/ E, D,/C,/ D, | !fermata!C,2 G, G, | %8
 A, G, A, G, | G,/F,/4E,/4 F, !fermata!E,2 | C ^F,/^G,/ A, A, | =G,/^F,/ G,2 F, | %12
 !fermata!G,2 E, =F, | G,/^F,/ G,/A,/ B,/C/ D/G,/ | G, ^F, !fermata!G,2 | G, G, F,/E,/ D, | %16
 G, A, B,/A,/ !fermata!G, | G, G, F, G, | A, G, G,/F,/4E,/4 F, | !fermata!E,4 |] %20
V:4
"C" C,"G" G,,"Am" A,,"G/B" B,, |"C" C,"C/E" E,,/F,,/"G7" G,,2 |"C" !fermata!C,,2"G/B" B,,"C" C, | %3
"F/A" A,,/B,,/"C" C,"F" F,,"C/E" E,,/F,,/ |"Gsus4" G,,2"C" !fermata!C,,2 | %5
"C" C,"G" G,,"Am" A,,"G/B" B,, |"C" C,"C/E" E,,/F,,/"G7" G,,2 |"C" !fermata!C,,2"G/B" B,,"C" C, | %8
"F/A" A,,/B,,/"C" C,"F" F,,"C/E" E,,/F,,/ |"Gsus4" G,,2"C" !fermata!C,,2 | %10
"C" C,"Bm7" B,,"Am" A,,/B,,/"Am/C" C,/D,/ |"Em" E,3/2 D,/"Am7/C" C,"D" D, | %12
"G" !fermata!G,,2"C" C,"F" F,, |"C/E" E,,/D,,/"C/E" E,,/^F,,/"G" G,,/A,,/"G/B" B,,/C,/ | %14
"Dsus4" D,"D7" D,,"G" !fermata!G,,2 |"G" G,"C/F" F,/E,/"Bdim/D" D,"Bdim" C,/B,,/ | %16
"C" C,"Dm/F" F,,"G" G,,"G" !fermata!G,, |"Em" E,,"Am7" A,,"Dm" D,,"C/E" E,, | %18
"F" F,,"C/E" E,,/F,,/"G7" G,,2 |"C" !fermata!C,,4 |] %20  