Construct chordal sequences to boost the harmonious coherence within the specified musical piece.
D | D3/2 E/ D d | A3/2 B/ A D | F E E D | F E E F | D3/2 E/ D d | A3/2 B/ A F | 
 D B B D | D B, B, :: d | d3/2 e/ f e/d/ | c e e d/e/ | f e e d/e/ | f e e d/e/ | 
 f/e/d/c/ B/c/d/B/ | A F G A | B D D3/2 E/ | D B, B, :|  
X:1
L:1/4
M:2/2
K:D
 D |"D" D3/2 E/ D d | A3/2 B/ A D |"A" F E E D | F E E F |"D" D3/2 E/ D d | A3/2 B/ A F | 
"Bm" D B B D | D B, B, :: d |"D" d3/2 e/ f e/d/ |"A" c e e d/e/ | f e e d/e/ | f e e d/e/ | 
"D" f/e/d/c/"G" B/c/d/B/ |"D" A F"G" G A |"Bm" B D D3/2 E/ | D B, B, :|  