Write a song that embodies the characteristics and nuances of Bach's masterpieces.  
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 A | A B c d | !fermata!e3 e | e d c d | !fermata!B3 B | c d e e | d2 !fermata!e e | c d e e | %8
 d2 !fermata!c e | g e e e | d2 !fermata!d d | e d c d | B2 !fermata!A z |] %13
V:2
 z3 E | F ^F/^G/ A A | !fermata!^G3 G | A A/^G/ A B | !fermata!^G3 G | A B c c | %6
 c B/A/ !fermata!B ^G | E D G A | A G/F/ !fermata!E G | G G/A/ B A | A/G/ A/^F/ !fermata!G G/=F/ | %11
 E ^F/^G/ A A | A ^G !fermata!E z |] %13
V:3
 z3 C | D D E F | !fermata!B,3 B, | C D E F | !fermata!E3 E | E F G G | A G/F/ !fermata!E B, | %7
 C G/F/ E/D/ C | C B, !fermata!G, C | D E E/D/ C | C/B,/ C/A,/ !fermata!B, B, | C B, A,/C/ F | %12
 E/D/4C/4 D !fermata!^C z |] %13
V:4
 z3"Am" A, |"Dm" D/C/"Bm" B,"Am" A,/G,/"Dm/F" F, |"E" !fermata!E,3"E7/D" D, | %3
"Am/C" C,"Bm" B,,"Am" A,,"Bdim/D" D, |"E" !fermata!E,3"E" E, | %5
"Am" A,"G7" =G,/F,/"C/E" E,/D,/"C" C, |"Dm7/F" F,"G" G,"E/G#" !fermata!^G,"E" E, | %7
"Am" A,"G/B" B,"C" C/B,/"Am" A,/G,/ |"Dm7/F" F,"G" G,"C" !fermata!C,"C" C | %9
"G/B" B,"C" C"E/G#" ^G,"Am" A,/=G,/ |"D7/F#" ^F,"Dpower" D,"G" !fermata!G,"G" G, | %11
"C" C,"Bm/D" D,/E,/"F" =F,"Dm/E" E,/D,/ |"Esus4" E,2"A" !fermata!A,, z |] %13  