Compose a melody that captures the essence of Bach's musical 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
L:1/4
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 A G A/B/ | c B !fermata!A c | c c c G | A c !fermata!B B | d d d/c/4B/4 A/B/ | %6
 c B !fermata!A B | c A G A/B/ | c B !fermata!A z |] %9
V:2
 z6 E2 | E2 E2 E2 E^G | A3 ^G !fermata!E2 A2 | A2 A2 G F2 E/D/ | E^F/G/ A2 !fermata!G2 G2 | %5
 G2 ^F^G AG AE | E A2 ^G !fermata!E2 G2 | A2 E2 E2 E^G | A3 ^G !fermata!E2 z2 |] %9
V:3
 z6 ED | C2 C2 B,2 CD | E2 FE/D/ !fermata!C2 E2 | E2 E2 EA, B,C | CB, A,D !fermata!D2 DC | %5
 B,A, B,2 A,D CB, | A,E FE/D/ !fermata!C2 E2 | E2 C2 B,2 CD | E2 FE/D/ !fermata!^C2 z2 |] %9
V:4
 z6"Am/C" C,B,, |"Am" A,,B,,"Am/C" C,D,"Em" E,D,"Am/C" C,B,, | %2
"Am" A,,C,"Bm7b5/D" D,E,"Am" !fermata!A,,2"Am" A,2 |"Am" A,,B,,"Am/C" C,D,"C/E" E,F,"G" G,2 | %4
"Am7/G" G,2"F#dim" ^F,2"G" !fermata!G,2"G" G,,A,, |"G/B" B,,C,"Bm/D" D,E,"Dm/F" =F,3 ^G,, | %6
"Am" A,,C,"Bm7b5/D" D,E,"Am" !fermata!A,,2"E" E,2 |"Am" A,,B,,"Am/C" C,D,"Em" E,D,"Am/C" C,B,, | %8
"Am" A,,C,"Bm7b5/D" D,E,"A" !fermata!A,,2 z2 |] %9  