Create a brilliant musical composition employing Bach's characteristic methods.  
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
V:2 treble 
%%MIDI program 0
%%MIDI control 7 100
%%MIDI control 10 64
L:1/4
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:1/4
V:1
 z6 A2 | B2 Bc/d/ cA e2 | ed/c/ BA !fermata!^G2 B2 | c2 de/f/ ec g2 | g^f/e/ dc !fermata!B2 e2 | %5
 ^d2 e2 ^fg/a/ gf | T^f4 !fermata!e2 A2 | B2 Bc/d/ cA e2 | ed/c/ BA !fermata!^G2 B2 | %9
 c2 de/f/ ec g2 | g^f/e/ dc !fermata!B2 e2 | ^d2 e2 ^fg/a/ gf | T^f4 !fermata!e2 e2 | %13
 cB ^ce af d2 | eg fe !fermata!f2 =B2 | e2 A2 de/f/ ed | c2 BA !fermata!A2 z2 |] %17
V:2
 z3 E | F E E3/2 E/ | A ^G/A/ !fermata!E G | A =G G3/2 G/ | c d/^F/ !fermata!G G | A G ^F E | %6
 ^F/G/ A !fermata!^G E | F E E3/2 E/ | A ^G/A/ !fermata!E G | A =G G3/2 G/ | c d/^F/ !fermata!G G | %11
 A G ^F E | ^F/G/ A !fermata!^G B | A A A3/2 F/ | _B A !fermata!A ^G | A/=G/ ^F ^G/A/ B | %16
 B/A/ ^G !fermata!E z |] %17
V:3
 z6 C2 | DC B,2 A,3 B, | C2 DC !fermata!B,2 E2 | E2 D2 C3 D | E2 A,D !fermata!D2 C2 | %5
 C2 B,2 B,2 B,E | E^D/^C/ D2 !fermata!B,2 =C2 | DC B,2 A,3 B, | C2 DC !fermata!B,2 E2 | %9
 E2 D2 C3 D | E2 A,D !fermata!D2 C2 | C2 B,2 B,2 B,E | E^D/^C/ D2 !fermata!B,2 E2 | E2 E2 D3 D | %14
 D2 ^C2 !fermata!D2 E2 | E2 D2 DC B,E | E2 DC !fermata!C2 z2 |] %17
V:4
 z3"Am" A, |"Bm7b5/A" A,"E/G#" ^G,"Am" A,3/2 =G,/ | %2
"Fmaj7" F,/E,/"G#dim7/F" F,/D,/"E" !fermata!E,"E" E, |"Am" A,"G/B" B,"C" C3/2 B,/ | %4
"Am7" A,/G,/"D/F#" ^F,/D,/"G" !fermata!G,"C" C |"D#dim7/F#" ^F,"Em/G" G,"B/D#" ^D,"Em" E, | %6
"Bsus4" B,"B7" B,,"E" !fermata!E,"Am" A, |"Bm7b5/A" A,"E/G#" ^G,"Am" A,3/2 =G,/ | %8
"Fmaj7" F,/E,/"G#dim7/F" F,/D,/"E" !fermata!E,"E" E, |"Am" A,"G/B" B,"C" C3/2 B,/ | %10
"Am7" A,/G,/"D/F#" ^F,/D,/"G" !fermata!G,"C" C |"D#dim7/F#" ^F,"Em/G" G,"B/D#" ^D,"Em" E, | %12
"Bsus4" B,"B7" B,,"E" !fermata!E,"E/G#" ^G, |"Am" A,"A7/G" =G,"Dm/F" F,3/2 _B,/ | %14
"Em7b5/G" G,/E,/"F+/A" A,"Dm" !fermata!D,"E7/D" D | %15
"Am/C" C/B,/"D7/C" C/D/"G#dim/B" B,/A,/"E/G#" ^G, |"Am" A,"E7" E,"Am" !fermata!A,, z |] %17  