Craft a musical piece that emulates Bach's 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 treble 
%%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/B/ | c B !fermata!A A/B/ | c B !fermata!A e | d c !fermata!B B | c c d d | e e d c | %6
 B2 !fermata!A e | d c !fermata!B e | d c !fermata!B B | c c d d | e e d c | B2 !fermata!A z |] %12
V:2
 z3 E | A ^G !fermata!E E | A ^G !fermata!E E/F/ | G E !fermata!E E | E E A G | G G/A/ B E | %6
 E3/2 D/ !fermata!C A | A/^G/ A !fermata!G A/=G/ | ^F G/A/ !fermata!G G | G/F/ E A/G/ ^F | %10
 B A/^G/ A A | A ^G !fermata!E z |] %12
V:3
 z3 C/D/ | E E/D/ !fermata!C C/D/ | E E/D/ !fermata!C G,/A,/ | B, A, !fermata!^G, G, | %4
 A,/B,/ C C B, | C C B, A, | A, ^G, !fermata!E, C | D E !fermata!E E | A, E/D/ !fermata!D D | %9
 E/D/ C/B,/ A, D | D C/B,/ A,/B,/ C/D/ | E3/2 D/ !fermata!^C z |] %12
V:4
 z3"Am" A,, |"Am" A,"E" E,"Am/C" !fermata!C,"Am" A,, |"Am" A,"E" E,"Am/C" !fermata!C,"C" C, | %3
"G" G,"Am" A,"E" !fermata!E,"E" E, |"Am" A,"Am" A,/G,/"Dm7/F" F,/D,/"G" G,/F,/ | %5
"C/E" E,/D,/"C" C,/B,,/"G#dim" A,,/^G,,/"Am" A,, |"Esus4" E,,2"Am" !fermata!A,,"Am" A,, | %7
"Bm" B,,"Am/C" C,/D,/"E" !fermata!E,"Am/C" C, |"D" D,"C/E" E,/^F,/"G" !fermata!G,"G" G,/=F,/ | %9
"C/E" E,"Am" A,/G,/"D/F#" ^F,"Bm" B,/A,/ |"E7/G#" ^G,"Am/C" C"D/F#" ^F,/G,/"Am" A, | %11
"Esus4" E,2"A" !fermata!A,, z |] %12  