Write a song that has the characteristics of Bach's musical 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 D | D E F2 | !fermata!E2 A B | c d/c/ B2 | !fermata!A2 z c | B A G G | A G F F | %7
 E2 !fermata!F E | E F G2 | !fermata!E2 A B | c d/c/ B2 | !fermata!A2 z ^F | G G G ^F | %13
 !fermata!G2 z E | F G E2 | !fermata!D3 z |] %16
V:2
 z3 A, | A, E E D | !fermata!^C2 E E | A A A ^G | !fermata!E2 z A | A/G/ F/E/ D G | %6
 G/ F E D/ C/D/ | C2 !fermata!C ^C/D/ | E3/2 D C/ D/B,/ | !fermata!C2 A A | A/^G/ A A G | %11
 !fermata!E2 z C | D D _E D | !fermata!D2 z ^C | D D2 ^C | !fermata!A,3 z |] %16
V:3
 z3 F,/G,/ | A, A, A,2 | !fermata!A,2 A, E | E D/E/ F E/D/ | !fermata!C2 z E | F/E/4D/4 C B, C | %6
 C C A, A, | G,/A,/ _B, !fermata!A, A, | A, A, G,2 | !fermata!G,2 E F | E D/E/ F E/D/ | %11
 !fermata!C2 z A, | G,3/2 F,/ _E,/_B,/ A,/C/ | !fermata!_B,2 z A, | A, G,/_B,/ A,/E,/ A,/G,/ | %15
 !fermata!^F,3 z |] %16
V:4
 z6"Dm" D,E, |"Dm/F" F,E,"Dsus2" D,^C,"Dm" D,E,"Dm/F" F,D, | %2
"A" !fermata!A,,4"Am/C" C,B,,"Asus2" A,,^G,, |"Am" A,,C,"Dm/F" F,E,"Bm7b5/D" D,B,,"E" E,2 | %4
"Am" !fermata!A,,4 z2"Am" A,,2 |"Bm7b5/D" D,E,"G7/F" F,4"C/E" E,2 | %6
"F" F,2"Csus4" C,2"Dm" D,2"F/A" A,,_B,, |"C" C,4"F" !fermata!F,,2"A" A,,2 | %8
"A/C#" ^C,2"Dm" D,=C,"G/B" B,,A,,"G/B" B,,G,, |"C" !fermata!C,4"Am/C" C,2"Bm7b5/D" D,2 | %10
"Am/E" E,2"Dm/F" F,E,"Bm7b5/D" D,2"E" E,2 |"Am" !fermata!A,,4 z2"F#dim/A" A,,2 | %12
"Gm/Bb" _B,,2"G/B" =B,,2"Cm" C,2"D" D,2 |"Gm" !fermata!G,,4 z2"A" A,,2 | %14
"Dm" D,C,"Gm/Bb" _B,,G,,"A" A,,4 |"D" !fermata!D,6 z2 |] %16  