Construct chordal sequences to boost the harmonious coherence within the specified musical piece.
A | dAF DFA | Bed cBA | dcd efg | fdf ecA | dAF DFA | Bed cBA | 
 dcd efg | fdd d2 :: e | fdf fga | ecd efg | dBd fed | cAA A2 c | 
 BGB Bcd | AFA ABc | dcd efg | fdd d2 :|  
X:1
L:1/8
M:6/8
K:D
 A |"D" dAF DFA |"G" Bed"A7" cBA |"D" dcd"A7" efg |"D" fdf"A7" ecA |"D" dAF DFA |"G" Bed"A7" cBA | 
"D" dcd"A7" efg |"D" fdd d2 :: e |"D" fdf fga |"A7" ecd efg |"Bm" dBd fed |"F#m" cAA A2 c | 
"G" BGB Bcd |"D" AFA ABc |"G" dcd"A7" efg |"D" fdd d2 :|  