Craft a harmonious piece that emulates the musical 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 nm="Piano" snm="Pno"
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:2 treble nm="Piano" snm="Pno"
%%MIDI channel 3
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:3 treble nm="Piano" snm="Pno"
%%MIDI channel 4
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:4 bass nm="Piano" snm="Pno"
%%MIDI channel 5
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:1
 z3 e | c d e/f/ g | f2 !fermata!e e/f/ | g g d e/d/ | c2 !fermata!B G | c d e/f/4g/4 f/e/ | %6
 !fermata!d3 e | c d e/f/ g | f2 !fermata!e e/f/ | g g d e | c2 !fermata!B G | c d e d/e/4f/4 | %12
 e d !fermata!c z |] %13
V:2
 z3 c | A B c c | c B !fermata!c G | c c3/2 B/ B | A2 !fermata!G D | G A/B/ c c | !fermata!G3 B | %7
 B/A/ A/G/ G/A/ _B/A/ | A ^G !fermata!A =c | d/B/ c A/G/ B | B A !fermata!G D | G F G A | %12
 G G !fermata!G z |] %13
V:3
 z3 G | F F G G | A G !fermata!G C/D/ | E/F/ G G G/F/ | E D !fermata!D B, | C/E/ F G/E/ C | %6
 !fermata!B,3 E | E/F/ F/G/ E2 | A, =B, !fermata!^C A | G/F/ E ^F/G/ G | G ^F !fermata!D B, | %11
 C3/2 B,/ C C | C B,/F/ !fermata!E z |] %13
V:4
 z3"C" C, |"F" F,"Bdim/E" E,/D,/"C" C,"C/E" E, |"Dm7" D,"G" G,"C" !fermata!C,"C" C | %3
"C" C,/D,/"C/E" E,/F,/"Gsus4" G,"Em" E, |"Am" A,/G,/"D7/F#" ^F,/D,/"G" !fermata!G,"G" G,/=F,/ | %5
"C/E" E,"Dm" D,"C" C,"Fpower" F, |"G" !fermata!G,3"E/G#" ^G, |"Am" A,"Bm7b5" B,"C" C"C#dim7" ^C | %8
"Dm/A" D"G#dim7/D" D,"A" !fermata!A,"Am" A, |"G/B" B,/G,/"C" C"D7/C" C/B,/"Em/A" A,/G,/ | %10
"Am9" A,"D7" D,"G" !fermata!G,"G" G,/=F,/ |"C/E" E,"Dm" D,"C" C,"Dm7/F" F, | %12
"C/G" G,"G" G,,"C" !fermata!C, z |] %13  