Compose a tune influenced by Bach's 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 bass 
%%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 D/E/ | F E !fermata!D D | F E !fermata!D A | G F !fermata!E E | F F G G | A A G F | %6
 E2 !fermata!D A | G F !fermata!E A | G F !fermata!E E | F F G G | A A G F | E2 !fermata!D z |] %12
V:2
 z3 A,/^C/ | D ^C !fermata!D _B, | B, ^C !fermata!A, A,/B,/ | C/_B,/ A,/=B,/ !fermata!^C C | %4
 D D D E | F F E D | D ^C !fermata!D =C | C A, !fermata!A, =C | D C/B,/ !fermata!C B, | ^C D D E | %10
 E/G/ F/E/ D/^C/ D | D ^C !fermata!A, z |] %12
V:3
 z3 F,/G,/ | A, A,/G,/ !fermata!F, G, | D, A, !fermata!F, =C,/D,/ | E, F,/G,/ !fermata!A, A, | %4
 A, _B, B,/A,/ G, | C D _B, A, | _B, A,/G,/ !fermata!F, F, | E, D, !fermata!^C, F, | %8
 F,/D,/ G, !fermata!G, ^G, | A,/=G,/ F,/E,/ D,/D/ C/_B,/ | A, A, D,/E,/ F,/D,/ | %11
 B, A,/G,/ !fermata!^F, z |] %12
V:4
 z3"Dm/F" F,/E,/ |"Dm" D,"A" A,,"Bb" !fermata!_B,,"Gm" G,, | %2
"G#dim7" ^G,,"A" A,,"Dm" !fermata!D,,"F" F,, |"C" C,"Dm" D,"A" !fermata!A,,"A" A,, | %4
"Dm" D,/C,/"Bb" _B,,/A,,/"Gm" G,,"C" C,/B,,/ | %5
"F/A" A,,/G,,/"Dm/F" F,,/E,,/"Em7b5/D" D,,/^C,,/"Dm" D,, | %6
"Em7b5/G" G,,"A" A,,"Dm" !fermata!D,,"F" F,, |"C" C,"Dm" D,"A" !fermata!A,,"F" F, | %8
"G7/B" B,,"G/B" G,,"C" !fermata!C,"E" E, |"F+/A" A,,"Bb" _B,,"G/B" =B,,"C" C, | %10
"A/C#" ^C,"Dm" D,"Gm/Bb" _B,,"Dm/A" A,, |"E7/G#" ^G,,"A" A,,"D" !fermata!D,, z |] %12  