Produce a tune that reflects elements 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
V:1
 z3 e | c d e/f/ g | f2 !fermata!e e/f/ | g g d e | c2 !fermata!B G | c d e e | !fermata!d3 e | %7
 c d e/f/ g | f2 !fermata!e e/f/ | g g d e | c2 !fermata!B G | c d e f | e d !fermata!c z |] %13
V:2
 z3 c | A B c/d/ e | e d c c | c/B/ c/A/ B/A/ G | G ^F G D | G =F E/F/ G | G3 B | A G G A | %8
 A/G/ A/B/ ^c =c | d c/B/ A B | B A ^G =G | G/A/ G/F/ E/G/ A/B/ | c B G z |] %13
V:3
 z3 G | F F G/F/ E/D/ | C G G A | G G G B, | C/B,/ C D B,/A,/ | G, A,/B,/ C C | B,3 E | %7
 E/F/ E/D/ C/D/ E | D/E/ F/G/ A A | G/F/ E ^F B, | E2 E E | E/F/ E/D/ C C | A D/E/4F/4 E z |] %13
V:4
 z3"C" C |"F" F/E/"Bdim/D" D"C" C3/2 B,/ |"Fmaj7/A" A,"G7/B" B,"C" C"Am" A, | %3
"C/E" E,/D,/"C/E" E,/F,/"G" G,/F,/"Em" E, |"Am9" A,2"G" G,"G7/F" F, | %5
"C/E" E,"Dm" D,"C" C,/D,/"C/E" E,/F,/ |"G" G,3"E/G#" ^G, |"Am" A,"Em7/B" B,"C" C"A7/C#" ^C | %8
"Dm" D"Dm" D,"A" A,"Am" A, |"G/B" B,"C" C"D7/C" C/B,/"Asus2" A,/^G,/ | %10
"Am" A,/B,/"Am/C" C/D/"E" E"Em" E, |"Am7" A,"Em7/B" B,"C" C/B,/"F/A" A,/G,/ | %12
"Fmaj7" F,"G" G,"C" C, z |] %13  