Develop a tune that showcases the foundational aspects of Bach's music.  
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
 A B c !fermata!c | c d e !fermata!e | e e d c | B3/2 A/ !fermata!A2 | e e f f | e e d !fermata!d | %6
 d d e e | d d c !fermata!c | c d e d/c/ | B B A !fermata!A |] %10
V:2
 E E E !fermata!E | E G G !fermata!G | G c3/2 B A/ | A ^G !fermata!E2 | A A A _B | %5
 _B A/G/ G/E/ !fermata!^F | G G G A | A G/F/ F/D/ !fermata!E | F F E E | %9
 ^F E/D/ D/B,/ !fermata!^C |] %10
V:3
 C B, A, !fermata!A, | A, B, C !fermata!C | C/D/ C/B,/ A,/B,/ C/E/ | F E/D/ !fermata!^C2 | %4
 ^C/D/ E/C/ D D | D ^C D !fermata!A, | B,/C/ D/B,/ C C | C B, C !fermata!G, | A, A, B, A, | %9
 A, ^G, A, !fermata!E, |] %10
V:4
"Am" A,2"E/G#" ^G,2"Am" A,2"Am" !fermata!A,,2 |"Am" A,2"G" G,2"C" C2"C" !fermata!C,2 | %2
"C" CB,"Am" A,G,"D7/F#" ^F,^G,"Am" A,2 |"Bm7b5/D" D,2"E" E,2"A" !fermata!A,,4 | %4
"A" A,,B,,"A/C#" ^C,A,,"Dm" D,=C,"Bb" _B,,A,, | %5
"Em7b5/G" G,,E,,"A" A,,2"Gpower/D" D,2"D" !fermata!D,,2 | %6
"G" G,,A,,"G/B" B,,G,,"C" C,B,,"Am" A,,G,, |"Dm7/F" F,,D,,"G" G,,2"Fpower/C" C,2"C" !fermata!C,,2 | %8
"F" F,2"Dm/E" E,D,"E/G#" ^G,,^G,"Asus4" A,2 |"B7/D#" ^D,2"E" E,2"Dpower/A" A,2"A" !fermata!A,,2 |] %10  