Create a tune that embodies the core elements 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
 z3 A | A A e d | e c !fermata!B A/B/ | c B c/d/ e | d c !fermata!B c/B/ | A A d/c/ B/c/ | %6
 A2 !fermata!G G | c B c/d/ e | d c !fermata!B A/B/ | c B c/d/ e | d c !fermata!B e | %11
 e e d/c/ B/c/ | B/^G/ A/B/ B2 | !fermata!A3 z |] %14
V:2
 z3 E/F/ | E E/D/ E F | E E !fermata!E E | A ^G A =G/A/ | B A !fermata!^G A | D/E/ ^F F G | %6
 G ^F !fermata!D E/=F/ | G D E/F/ G | ^G A !fermata!G E | D D E/F/ G | F/E/ E !fermata!E ^G | %11
 A =G F3/2 E/ | F E/F/ E/F/ E/D/ | !fermata!^C3 z |] %14
V:3
 z3 C/D/ | C/B,/ A, A,/C/ B,/A,/ | B, A, !fermata!^G, A, | E E E E | F E !fermata!E E | A, D D E | %6
 D/C/4B,/4 C !fermata!B, C | G,/A,/ B,/A,/ G, C | D E !fermata!E C/B,/ | A, B,/A,/ G, C | %10
 C/B,/ B,/A,/ !fermata!^G, B, | C ^C D3/2 E/ | D C/A,/ ^G,/ A, G,/ | !fermata!E,3 z |] %14
V:4
 z6"Am" A,,2 |"Am" A,2"F" F,2"Am/C" C,2"Bdim/D" D,2 | %2
"E/G#" ^G,,2"Am" A,,2"E" !fermata!E,2"Am/C" C,B,, |"Am" A,,2"E" E,2"Am" A,B,"C" C2 | %4
"G#dim7" ^G,2"Am" A,2"E" !fermata!E,2"Am" A,=G, |"D/F#" ^F,E,"D" D,C,"Bm" B,,2"Em" E,C, | %6
"Dsus4" D,4"G" !fermata!G,,2"C" C,D, |"C/E" E,F,"G" G,F,"C/E" E,2"C/D" D,C, | %8
"G#dim/B" B,,2"Am" A,,2"E" !fermata!E,2"Am" A,G, |"D7/F#" ^F,D,"G" G,=F,"C/E" E,D,"C" C,B,, | %10
"Dm7/A" A,,^G,,"Am" A,,2"E" !fermata!E,2"E" E,2 | %11
"Am" A,G,"C#dim/F" F,E,"Dm9/E" F,E,"Bdim/D" D,=C, |"Bdim/D" D,B,,"Am/C" C,D,"E" E,D,"Esus4" E,2 | %13
"A" !fermata!A,,6 z2 |] %14  