Produce a track with Bach-like melodies.  
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 E | A G F E | D2 !fermata!E B | c c B/A/ B | !fermata!A3 E | A G F E | D2 !fermata!E B | %7
 c c B/A/ B | !fermata!A3 c | B/A/ G A B | c2 !fermata!c G | A G F F | !fermata!E3 c | B/c/ d c B | %14
 A2 !fermata!B E | F E D G | !fermata!E3 z |] %17
V:2
 z3 C | C C C/D/ D/C/ | C B, !fermata!C D | C/D/ E E E/D/ | !fermata!C3 C | C C C/D/ D/C/ | %6
 C B, !fermata!C D | C/D/ E E E/D/ | !fermata!C3 A/=G/ | F E/D/ C F | F E/D/ !fermata!E E | %11
 F E E D | !fermata!^C3 D | D D E D | E D !fermata!D C | C/B,/ C C B, | !fermata!C3 z |] %17
V:3
 z3 G, | F, G, A,/G,/ G, | A, G, !fermata!G, ^G, | E, A, A, ^G, | !fermata!A,3 G, | %5
 F, G, A,/G,/ G, | A, G, !fermata!G, ^G, | E, A, A, ^G, | !fermata!A,3 E | D/C/ B, A,/G,/ F,/G,/ | %10
 A, G,/F,/ !fermata!G, C | C C/B,/ A, A, | !fermata!A,3 A, | G, G,/^F,/ G,/A,/ B,/G,/ | %14
 E,/A,/ ^F, !fermata!G, G, | F, G, A, D,/G,/ | !fermata!G,3 z |] %17
V:4
 z3"C" C, |"F" F,"C/E" E,"F/A" A,,/B,,/"C" C, |"Dm7/F" F,,"G" G,,"C" !fermata!C,"G#dim/B" B,, | %3
"Am" A,,/B,,/"Am/C" C,/D,/"Esus4" E,"E" E,, |"Am" !fermata!A,,3"C" C, | %5
"F" F,"C/E" E,"F/A" A,,/B,,/"C" C, |"Dm7/F" F,,"G" G,,"C" !fermata!C,"G#dim/B" B,, | %7
"Am" A,,/B,,/"Am/C" C,/D,/"Esus4" E,"E" E,, |"Am" !fermata!A,,3"Am" A, | %9
"Bdim/D" D,"Em" E,"F" F,/E,/"Bdim/D" D, |"F/C" C,2"C" !fermata!C,"C" C, | %11
"F" F,"C" C,"Dm" D,/E,/"Dm/F" F,/G,/ |"A" !fermata!A,3"D7/F#" ^F, | %13
"G" G,"G/B" B,,"C/E" E,/^F,/"G" G, |"Am/C" C,"D" D,"G" !fermata!G,,"C" C,/B,,/ | %15
"F/A" A,,"C/G" G,,"Dm7/F" F,,"G" G,, |"C" !fermata!C,,3 z |] %17  