Develop a musical work that reflects the essence 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
L:1/8
V:1
 z3 c | c d e d/e/ | f/e/ d !fermata!c e | f e d c | B/c/ Tc3/4B/8c/8 !fermata!d g | f e d c/B/ | %6
 A3/4B/8c/8 A !fermata!G e | f e d c/d/ | e d !fermata!c z |] %9
V:2
 z3 G | A3/2 G/ G/A/ B | A/c/4B/4 A/B/ !fermata!G c | c/ d c/ B/A/4^G/4 A | =G G !fermata!G B | %5
 A G/^F/4G/4 A/B/4A/4 G | G ^F !fermata!G B | A G A/B/ c | c B !fermata!G z |] %9
V:3
 z3 E | E D/B,/ C D | D/G/ F/E/4D/4 !fermata!E G | A/ ^G A/ F E | D E !fermata!B, E/D/ | %5
 C/D/ E ^F E | E/C/ D !fermata!B, B, | C/D/ E A,/ E F/ | G F/4E/4F/ !fermata!E z |] %9
V:4
 z6"C" CB, |"Am" A,G,"Dm/F" F,G,"C" C,2"G" G,2 |"Dm" D,E,"Dm/F" F,G,"C" !fermata!C,2"C" CB, | %3
"F/A" A,2"Am" A,2"Bm7b5/A" A,3 =G, |"G7/F" F,E,"C/D" D,C,"G" !fermata!G,2"Em" E,2 | %5
"F/A" A,B,"C" C3 B,"C/E" ED |"Am7/C" CA,"D" D2"G" !fermata!G,2"E/G#" ^G,2 | %7
"F/A" A,B,"C" C2"D/F#" ^F,^G,"Am" A,=G,/=F,/ |"C/E" E,F,"G7" G,2"C" !fermata!C,2 z2 |] %9  