Create a composition that showcases the signature characteristics of Bach's musical style.  
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
 A E A B | c d B2 | !fermata!A2 c B | A B c d | !fermata!e4 | A E A B | c d B2 | !fermata!A2 c B | %8
 A B c d | !fermata!e4 | e f g c | f e d2 | !fermata!c2 d d | e A d c | B2 !fermata!A2 |] %15
V:2
 E E E D | E A A ^G | !fermata!E2 A ^G | A E E A | !fermata!^G4 | E E E D | E A A ^G | %7
 !fermata!E2 A ^G | A E E A | !fermata!^G4 | A A G A | A/_A/ G G3/2 F/ | !fermata!E2 G G | %13
 G ^F/E/ F/^G/ A | A ^G !fermata!E2 |] %15
V:3
 C C C/ A, B,/4A,/4 | ^G, A, E3/2 D/ | !fermata!C2 E D | E E/D/ C/B,/ A, | !fermata!B,4 | %5
 C C C/ A, B,/4A,/4 | ^G, A, E3/2 D/ | !fermata!C2 E D | E E/D/ C/B,/ A, | !fermata!B,4 | %10
 C D D/C/ C | C/B,/ C C B, | !fermata!G,2 B, B, | C/G,/ D D E | E3/2 D/ !fermata!^C2 |] %15
V:4
"Am" A,,2"Am" A,G,"F#m7b5" ^F,2"Bm7b5/F" =F,2 |"C+/E" E,2"Dm/F" F,D,"Esus4" E,4 | %2
"Am" !fermata!A,,4"Am" A,2"G#dim/B" B,2 |"Am/C" C2"E/G#" ^G,2"Am" A,B,"Dm/F" F,2 | %4
"E" !fermata!E,8 |"Am" A,,2"Am" A,G,"F#m7b5" ^F,2"Bm7b5/F" =F,2 |"C+/E" E,2"Dm/F" F,D,"Esus4" E,4 | %7
"Am" !fermata!A,,4"Am" A,2"G#dim/B" B,2 |"Am/C" C2"E/G#" ^G,2"Am" A,B,"Dm/F" F,2 | %9
"E" !fermata!E,8 |"Am" A,2"Dm/G" G,F,"Em" E,2"F" F,E, |"Dm7" D,2"C/E" E,F,"Gsus4" G,4 | %12
"C" !fermata!C,4"G" G,F,"Em7" E,D, |"C" C,E,"D" D,C,"Bm" B,,2"Am" A,,2 | %14
"Esus4" E,4"A" !fermata!A,,4 |] %15  