Develop well-balanced harmonic arrangements to enrich the provided music piece.
A/B/ d/e/f/g/ | a a a a |"^(A)" a a a/b/a/g/ | g f f ^e | f2- f/e/f/g/ | f e e ^d | 
 e2- e/f/g/a/ | g f f ^e | f A/B/ d/e/f/g/ | a a a a |"^(A)" a a a/b/a/g/ | g f f ^e | 
 f2- f/e/f/g/ | f e e ^d | e c/e/ a c | d2 f2 |1 d :|2 d4 |:[K:A] E/E/E/E/ A c | 
 E/E/E/E/ A c | G B e3/2 d/ | c B c/B/ A | E/E/E/E/ A c | E/E/E/E/ A c | G B e3/2 c/ | 
 A A A z :|[K:D] a a a a |"^(A)" a a a/b/a/g/ | g f f ^e | f2- f/e/f/g/ | f e e ^d | 
 e2- e/f/g/a/ | g f f ^e | f A/B/ d/e/f/g/ | a a a a |"^(A)" a a a/b/a/g/ | g f f ^e | 
 f2- f/e/f/g/ | f e e ^d | e c/e/ a c | d2 f2 | d |:[K:G] B, C ^C | D3 E/D/ | ^C D E D | 
 G4- | G G F E | D3 D | F2 A2 | E3 ^D | D B, C ^C | D3 E/D/ | ^C D E D | G4- | 
 G G F E | D2 F2 | B2 A2 | G4- | G :|  
X:1
L:1/4
M:2/4
K:D
 A/B/ d/e/f/g/ |"D" a a a a |"^(A)" a a a/b/a/g/ |"D" g f f ^e | f2- f/e/f/g/ |"A" f e e ^d | 
 e2- e/f/g/a/ |"D" g f f ^e | f A/B/ d/e/f/g/ | a a a a |"^(A)" a a a/b/a/g/ |"D" g f f ^e | 
 f2- f/e/f/g/ |"A" f e e ^d | e c/e/ a c |"D" d2 f2 |1 d :|2 d4 |:[K:A]"A" E/E/E/E/ A c | 
 E/E/E/E/ A c |"E" G B e3/2 d/ |"A" c B c/B/ A | E/E/E/E/ A c | E/E/E/E/ A c |"E" G B e3/2 c/ | 
"A" A A A z :|[K:D]"D" a a a a |"^(A)" a a a/b/a/g/ |"D" g f f ^e | f2- f/e/f/g/ |"A" f e e ^d | 
 e2- e/f/g/a/ |"D" g f f ^e | f A/B/ d/e/f/g/ | a a a a |"^(A)" a a a/b/a/g/ |"D" g f f ^e | 
 f2- f/e/f/g/ |"A" f e e ^d | e c/e/ a c |"D" d2 f2 | d |:[K:G] B, C ^C |"G" D3 E/D/ | ^C D E D | 
 G4- | G G F E |"D" D3 D | F2 A2 |"Gdim" E3 ^D |"G" D B, C ^C |"G" D3 E/D/ | ^C D E D | G4- | 
 G G F E |"D" D2 F2 | B2 A2 |"G" G4- | G :|  