Develop a musical work that captures the essence of Bach's compositions.  
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
L:1/8
V:1
 z3 c | g g g g | a g/f/ !fermata!e d | e/^f/ g g/a/ f | !fermata!g3 g | g g g/f/ e/f/ | %6
 g f/e/ !fermata!d g | f e d d/e/ | c/d/ e/f/ !fermata!g g | f e d d | !fermata!c3 z |] %11
V:2
 z3 G | G/A/ B c c | c B !fermata!G G | G/A/ B A B/c/ | !fermata!B3 B | c B/A/ G G/F/ | %6
 E/C/ A !fermata!B e/d/ | c3/2 B/ A B | A/B/ c/d/ e A | A/B/ c c B | !fermata!G3 z |] %11
V:3
 z3 E | D G/F/ E/F/ G | F/E/ D !fermata!C B, | C D D D | !fermata!D3 D | E D/C/ D C | %6
 C C !fermata!G B, | C/D/ E/C/ F3/2 E/ | E A, B, E | F/G/ A A G/F/ | !fermata!E3 z |] %11
V:4
 z6"C" C2 |"G/B" B,2"G" G,2"C" CD"C/E" EC |"F" F,2"G" G,2"C" !fermata!C,2"G" G,2 | %3
"C" C2"G/B" B,C"Dsus4" D2"Bm/D" D,2 |"G" !fermata!G,6"G" G,F, |"C/E" E,F,"G" G,A,"G/B" B,G,"C" C2 | %6
"C/E" E,2"F" F,2"G" !fermata!G,2"Em" E,2 |"F/A" A,B,"C" C2"Dm7/C" CB,"Bm7b5/A" A,^G, | %8
"Am" A,2"Am7/G" =G,F,"Em" !fermata!E,2"A7/C#" ^C2 |"Dm" D2"Am" A,G,"Dm7/F" F,D,"G" G,2 | %10
"C" !fermata!C,6 z2 |] %11  