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
 z3 A | A A ^G/^F/ E | A B c c | d c !fermata!B B | c d e/d/ c | f f e/d/ e | d2 !fermata!c c | %7
 B A G E/=F/ | G G A G | F2 !fermata!E e | d c/B/ B2 | !fermata!A3 z |] %12
V:2
 z3 E | F C/D/ E B, | E E E E | E2 !fermata!E E | E G G A/G/ | F G G c/B/ | A G/F/ !fermata!E E | %7
 D C D C/D/ | E E F E | E/^C/ D !fermata!D =C | F E E3/2 D/ | !fermata!^C3 z |] %12
V:3
 z3 C | D A, B,/A,/ ^G, | A, ^G, A,/B,/ C | B, A, !fermata!^G, G, | A, B, C/B,/ A,/B,/ | C D D C | %6
 C B, !fermata!G, A,/G,/ | F, F,/E,/ D,/G,/ G, | C C C _B, | A,3/2 ^G,/4A,/4 !fermata!=B, A, | %10
 A,/^G,/ A, A, G, | !fermata!E,3 z |] %12
V:4
 z3"Am" A, |"Dm" D,/E,/"F" F,"E" E,"E" E,/D,/ |"Am/C" C,"E" E,"Am" A,,"Am" A, | %3
"E7/G#" ^G,"Am" A,"E" !fermata!E,"E" E, |"Am" A,"G" G,"C" C,"F" F,/G,/ | %5
"F/A" A,"G7/B" B,"C" C/B,/"Am" A,/G,/ |"Dm7/F" F,"G" G,"C" !fermata!C,"Am" A,, | %7
"Bdim/D" D,/E,/"F" F,"G/B" B,,"C" C, |"C" C/_B,/"Am7" A,/G,/"F" F,/E,/"Em7b5/D" D,/^C,/ | %9
"Dm" D,2"E7/G#" !fermata!^G,,"Am" A,, |"Bm7b5" B,,"Am/C" C,/D,/"Esus4" E,"E" E,, | %11
"A" !fermata!A,,3 z |] %12  