Create a composition that mimics the style of Bach's masterpieces.  
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 G | c d e a | g3/2 f/ !fermata!e a | g f e f/g/ | d2 !fermata!c G | c d e a | %6
 g3/2 f/ !fermata!e a | g f e f/g/ | d2 !fermata!c g | a a !fermata!d d | g g !fermata!c e | %11
 d c B c/B/ | A2 !fermata!G g | f e d e/f/ | d2 !fermata!c z |] %15
V:2
 z3 E/F/ | G G G A/B/ | c B !fermata!c c | B c/d/ e/d/ c | c B !fermata!G E/F/ | G G G A/B/ | %6
 c B !fermata!c c | B c/d/ e/d/ c | c B !fermata!G c | c c !fermata!B B/c/ | d/c/ B !fermata!A A | %11
 A G/^F/ G G | G ^F !fermata!G c/B/ | A G/A/ B c | c B !fermata!G z |] %15
V:3
 z3 C/D/ | E D C C/D/ | E D/G/ !fermata!G F/E/ | D A G A | A G/F/ !fermata!E C/D/ | E D C C/D/ | %6
 E D/G/ !fermata!G F/E/ | D A G A | A G/F/ !fermata!E E | F/E/ D !fermata!G G | D E !fermata!E C | %11
 D D D C/D/ | E D/C/ !fermata!B, C | C/D/ E/F/ G G | G/F/4E/4 F/D/ !fermata!E z |] %15
V:4
 z3"C" C, |"C" C"G/B" B,"C" C"F" F, |"C/E" E,/F,/"G" G,"C" !fermata!C,"F" F, | %3
"G" G,"F/A" A,/B,/"C" C/B,/"F/A" A,/G,/ |"Dm7/F" F,"G" G,"C" !fermata!C,"C" C, | %5
"C" C"G/B" B,"C" C"F" F, |"C/E" E,/F,/"G" G,"C" !fermata!C,"F" F, | %7
"G" G,"F/A" A,/B,/"C" C/B,/"F/A" A,/G,/ |"Dm7/F" F,"G" G,"C" !fermata!C,"C" C | %9
"F" F,"D7/F#" ^F,"G" !fermata!G,"G" G,/A,/ |"G/B" B,"Em" E,"Am" !fermata!A,"Am" A,/G,/ | %11
"D/F#" ^F,/E,/"D/F#" D,"G" G,/F,/"C/E" E,/D,/ |"Am7/C" C,"D" D,"G" !fermata!G,"C/E" E, | %13
"F/A" A,/B,/"C" C"G" G,/F,/"C/E" E,/C,/ |"Gsus4" G,2"C" !fermata!C, z |] %15  