Develop a musical creation that emulates the style of Bach  
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 e | ^d e/^f/ g a | g ^f !fermata!e e | c d e d/c/ | B2 !fermata!A e | ^d e/^f/ g a | %6
 g ^f !fermata!e e | c d e d/c/ | B2 !fermata!A z | A c d A | c d !fermata!e e | a ^g a b | %12
 g ^f !fermata!e e/=f/ | g e g d | c B !fermata!A2 | e d c B | !fermata!A3 z |] %17
V:2
 z3 c | B B/^d/ e ^f | e ^d B B | A G G A | A ^G E c | B B/^d/ e ^f | e ^d B B | A G G A | %8
 A ^G E z | E A/G/ A F | E D C G | c B A e | e ^d B c | d G G F | E/ A G/ G F | E/^F/ ^G A/f/ G | %16
 E3 z |] %17
V:3
 z3 A/G/ | ^F G/A/ B B | B B/A/ ^G E | E D C/D/ E | F E/D/ C A/G/ | ^F G/A/ B B | B B/A/ ^G E | %7
 E D C/D/ E | F E/D/ C z | C C F D | C G G E | E D E E | B B/A/ G E | D C C B, | C D D2 | %15
 B,2 C/A,/ E/D/ | ^C3 z |] %17
V:4
 z3"Am" A, |"B" B,/A,/"Em/G" G,/^F,/"Em" E,"B7/D#" ^D, |"Em" E,"B" B,"E" E,"E/G#" ^G, | %3
"Am" A,"G/B" B,"C" C"Asus4" A, |"Bm7b5/D" D,"E" E,"Am" A,"Am" A, | %5
"B" B,/A,/"Em/G" G,/^F,/"Em" E,"B7/D#" ^D, |"Em" E,"B" B,,"E" E,"E/G#" ^G, | %7
"Am" A,"G/B" B,"C" C"Asus4" A, |"Bm7b5/D" D,"E" E,"Am" A,, z | %9
"Am" A,/G,/"F" F,/E,/"Dm" D,/E,/"Dm/F" F,/G,/ |"Am" A,"G/B" B,"C" C"C" C | %11
"Am" A,"G#dim/B" B,"Am/C" C"Em/G" G,/A,/ |"Em/B" B,"B" B,,"Em" E,"Am" A, | %13
"G/B" B,"C" C"C/E" E,/F,/"G7" G, |"Am" A,"Bm" B,/>^C/"Dsus4" D2 | %15
"E/G#" ^G,"E7" E,"Am" A,/D,/"E" E, |"A" A,3 z |] %17  