Develop a piece of music that mirrors the essence of Bach's noteworthy achievements.  
X:1
T:Music21 Fragment
T:Music21 Fragment
T:Music21
C:Music21
%%score 1 2 3 4
L:1/8
M:4/4
K:C
V:1 treble 
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
L:1/4
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 | ^d e/^f/ g a | g ^f !fermata!e e/=d/ | c d e/d/ c | B/A/ B !fermata!A e | ^d e/^f/ g a | %6
 g ^f !fermata!e e/=d/ | c d e/d/ c | B/A/ B !fermata!A z | A/B/ c d A/B/ | c d !fermata!e e | %11
 a =g a b/a/ | g ^f !fermata!e f | g/f/ e/f/ g d | c B !fermata!A2 | e d c B | !fermata!A3 z |] %17
V:2
 z6 c2 | B3 ^d ed/e/ ^f2 | ^f e2 ^d !fermata!B2 B2 | B A2 ^G/^F/ EG A2 | %4
 A^G/^F/ G2 !fermata!E2 c2 | B3 ^d ed/e/ ^f2 | ^f e2 ^d !fermata!B2 B2 | B A2 ^G/^F/ EG A2 | %8
 A^G/^F/ G2 !fermata!E2 z2 | E2 A2 A3 E | EF/G/ A2 !fermata!^G2 B2 | e2 d2 e^c ^f2 | %12
 f e2 ^d !fermata!B2 c2 | B2 G2 G4 | A3 G !fermata!^F4 | ^GA AB E A2 G | !fermata!E6 z2 |] %17
V:3
 z6 AG | ^F2 GA B c2 B | BE ^F/G/A A!fermata!^G E2 | E =F2 E/D/ E2 E2 | E3 D !fermata!C2 AG | %5
 ^F2 GA B c2 B | BE ^F/G/A A!fermata!^G E2 | E =F2 E/D/ E2 E2 | E3 D !fermata!C2 z2 | %9
 CD E2 A,2 D2 | CD/E/ F2 !fermata!B,2 ^G2 | AB/c/ dB EA ^FE/^D/ | EG cB !fermata!G2 A2 | %13
 D2 ED C3 B, | E2 D2 !fermata!D4 | E2 ^F^G AC =FE/D/ | !fermata!^C6 z2 |] %17
V:4
 z6"Am" A,2 |"B7/A" A,2"Em/G" G,^F,"Em" E, E2 ^D |"Em" EC"B7" A,B,"Esus4" !fermata!E,2"E/G#" ^G,2 | %3
"Am" A,2"Bm7b5" B,2"C" CB,"Am/C" CD |"Esus4" E2"E" E,2"Am" !fermata!A,2"Am" A,2 | %5
"B7/A" A,2"Em/G" G,^F,"Em" E, E2 ^D |"Em" EC"B7" A,B,"Esus4" !fermata!E,2"E/G#" ^G,2 | %7
"Am" A,2"Bm7b5" B,2"C" CB,"Am/C" CD |"Esus4" E2"E" E,2"Am" !fermata!A,2 z2 | %9
"Am" A,3 G,"Dm/F" F,E,"D/F#" ^F,^G, |"Am" A,G,"Dm/F" F,2"E" !fermata!E,2"E" ED | %11
"Am/C" CB,/A,/"G/B" B,D"A/C#" ^C^F"B/D#" ^DB, | %12
"Em" EC"F#m7b5/A" A,B,"Em" !fermata!E,2"F#dim/A" A,2 |"G" G,2"C" C,D,"C/E" E,F,"Gsus4" G,2 | %14
"Am7/G" G,^F,"G" G,B,"D" !fermata!D4 |"Am/C" D C2 B,"Am" A,=F,"Bm7b5/D" D,E, | %16
"A" !fermata!A,6 z2 |] %17  