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
V:1
 z3 A | c B c d | e e d c | B2 !fermata!B B | e d d c | B c d c | B B !fermata!A z |] %7
V:2
 z3 E | A B3/2 A G/ | G G G/F/ E | E2 !fermata!E E | E ^F ^G A | A/^G/ A A/G/ A | %6
 A3/2 ^G/ !fermata!E z |] %7
V:3
 z3 C | E E E D | D/C/4B,/4 C B,3/2 A,/ | A, ^G,/^F,/ !fermata!G, G, | A, A, B, C/D/ | E E D E | %6
 F E/>D/ !fermata!^C z |] %7
V:4
 z3"Am" A,, |"Am" A,3/2 ^G,/"Am" A,/A,,/"Bm" B,, |"C/D" C,/D,/"C/E" E,/F,/"G" G,"Am" A, | %3
"Esus4" E,2"E" !fermata!E,,"E" E,/D,/ |"Am/C" C,"D7/C" C,"G#dim/B" B,,"Am" A,, | %5
"Esus4" E,"Am" A,/=G,/"Dm/F" F,"Am/E" E, |"Bm7b5/D" D,"Esus4" E,"A" !fermata!A,, z |] %7  