Produce a tune incorporating aspects of 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 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 e | e d/c/ B e | d/c/ B !fermata!c e | e d/c/ B e | d/c/ B !fermata!c e | ^f ^g a e/f/ | %6
 =g ^f !fermata!e f | g ^f e e | d/c/ B !fermata!c d | d e d/c/ B | c c !fermata!B ^f | g ^f e B | %12
 e e !fermata!^d z |] %13
V:2
 z3 B | c A G c | B B !fermata!A ^c | A2 A/G/ G | F F/E/ !fermata!E c | c B A A | %6
 B B !fermata!B B | B B3/2 G/ c/B/ | A G/F/ !fermata!E A | G G ^F ^G | A A3/2 !fermata!=G/ B | %11
 B c B B | B ^A !fermata!B z |] %13
V:3
 z3 ^G | A D D G | G F/E/ !fermata!E A | A D D _B, | A, =B, !fermata!A, E | D E E E | %6
 E ^D/A/ !fermata!G ^F | ^F/ E D/ E E | F/E/ D !fermata!C C | B, C/B,/ A, E | E E !fermata!E ^F | %11
 E ^D E/^F/ G/F/ | E ^F !fermata!F z |] %13
V:4
 z3"E" E/D/ |"Am/C" C/A,/"D/F#" ^F,"G" G,"C/E" E,/C,/ |"G" G,"G#m" ^G,"Am" !fermata!A,"A" A,/=G,/ | %3
"F" F,"D/F#" ^F,"G" G,"C#dim7" ^C, |"Dm" D,"G#m" ^G,,"Am" !fermata!A,,"Am" A, | %5
"D" D,"E7/D" D"A/C#" ^C"Am/C" =C |"Em/B" B,/A,/"B" B,"Em" !fermata!E,"B/D#" ^D, | %7
"Em" E,"Bsus4" B,"C" C/B,/"Am" A,/G,/ |"Dm/F" F,"G" G,"C" !fermata!C,"D7/F#" ^F, | %9
"G" G,"C" C,"D" D,"E" E, |"Am" A,,/B,,/"Am/C" C,/D,/"Esus4" !fermata!E,"B/D#" ^D, | %11
"Em" E,"D#dim7/A" A,"Em/G" G,/^F,/"Em" E,/D,/ |"C#m" ^C,"F#" ^F,"B" !fermata!B,, z |] %13  