Produce a musical work containing the essence of Bach's style.  
X:1
T:Music21 Fragment
T:Music21 Fragment
T:Music21
C:Music21
%%score 1 2 3 4
L:1/8
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
L:1/4
V:3 treble 
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
L:1/4
V:4 bass 
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
V:1
 e2 ef gf e2 | d3 d !fermata!d4 | e2 fe d3 c | !fermata!c4 BA Bc | dc B2 A3 A | !fermata!A4 B2 cB | %6
 A3 G !fermata!G4 | e2 ef g2 fe | d3 d !fermata!d4 | e2 fe d3 c | !fermata!c4 fe fg | ed ef Td3 c | %12
 !fermata!c8 |] %13
V:2
 G A G c/B/ | A G/^F/ !fermata!G2 | G F/G/ A G/4F/4E/4F/4 | !fermata!E2 D G | G G G/^F/ E | %5
 !fermata!^F2 F E | E D !fermata!D2 | D C D G | A/G/ A !fermata!G2 | G F/G/ A B | !fermata!A2 A G | %11
 G c c B | !fermata!G4 |] %13
V:3
 C C/D/ E/D/ C | C B,/A,/ !fermata!B,2 | C C C B, | !fermata!G,2 G, D | D D D D/^C/ | %5
 !fermata!D2 B,/A,/ G, | G, ^F, !fermata!B,2 | B A =G C | F3/2 F/ !fermata!F2 | E/D/ C C B,/E/ | %10
 !fermata!E2 D D | D C A G/F/ | !fermata!E4 |] %13
V:4
"C" CB,"Am" A,2"Em" E,2"Am" A,G, |"D7/F#" ^F,E,"G/D" D,2"G" !fermata!G,4 | %2
"C" CB,"F/A" A,G,"Dm7/F" F,2"G" G,2 |"C" !fermata!C,4"G" G,^F,"G" G,A, | %4
"G/B" B,A,"G/B" B,C"Dsus4" D2"Asus4" A,2 |"D" !fermata!D,4"B/D#" ^D,2"C/E" E,=D, | %6
"Am7/C" C,2"D" D,2"G" !fermata!G,4 |"E7/G#" ^G,2"Am" A,2"G/B" B,2"Csus4" C2 | %8
"Dm7/C" CB,"Dm7/C" CA,"G7/B" !fermata!B,4 |"C" CB,"F/A" A,G,"D7/F#" ^F,2"G#dim" ^G,2 | %10
"Am" !fermata!A,4"Dm" DC"G7/B" B,G, |"C" CB,"Am" A,G,"Dm7/F" F,2"G" G,2 |"C" !fermata!C,8 |] %13  