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:1/4
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
L:1/8
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 e/d/ | c d e/f/ g | f2 !fermata!e e/f/ | g g d e/d/ | c2 !fermata!B G | c d e/d/ e/f/ | %6
 !fermata!d2 z e/d/ | c d e/f/ g | f2 !fermata!e e/f/ | g g d e/d/ | c2 !fermata!B G | %11
 c d e/f/ g/f/ | e d !fermata!c z |] %13
V:2
 z6 cB | A3 B c3 G | A2 G2 !fermata!G2 c2 | cB cd BA G2 | G2 ^F2 !fermata!G2 D2 | GA B2 cB cd | %6
 !fermata!B4 z2 B2 | A2 G2 GF E2 | ED/C/ D2 !fermata!C2 c2 | de dc BA B2 | %10
 BA/G/ A2 !fermata!G2 GF | EF ED C2 c2 | GA DG !fermata!E2 z2 |] %13
V:3
 z3 G | A/G/ F G C | C B, !fermata!C G | G G G/F/ E | E D !fermata!D B, | C F G/F/ G/A/ | %6
 !fermata!G2 z ^G | E/F/ E/D/ C C | C/ A G/ !fermata!G A | G D D/C/ B,/A,/ | %10
 G,/ E D/ !fermata!D E/D/ | C B,/A,/ G,3/2 A,/ | B,/ C B,/ !fermata!G, z |] %13
V:4
 z6"C" C2 |"F" FE"Dm" D2"C" C2"C/E" E,2 |"Dm7" D,2"G" G,2"C" !fermata!C,2"C" CD | %3
"C/E" E2"C/E" E,F,"G" G,2"C" CB, |"Am7" A,2"D" D,2"G" !fermata!G,2"G" G,F, | %5
"C/E" E,F,"Bdim/E" E,D,"C" C,2"C" CF, |"G" !fermata!G,4 z2"E" E,2 | %7
"Am" A,2"Em7/B" B,2"C" CD"C" CB, |"Fmaj7/A" A,2"Bm7b5" B,2"C" !fermata!C2"Am" A,2 | %9
"G/B" B,C"G/B" B,A,"G" G,A,"Em/G" G,^F, |"Cmaj7/E" E,2"F#m7b5" ^F,2"G" !fermata!G,2"Em" E,2 | %11
"Am" A,2"Em7/G" G,F,"C/E" E,D,"C/E" E,F, |"Em/G" G,F,"Gsus4" G,2"C" !fermata!C,2 z2 |] %13  