Formulate chord sequences to heighten the harmonic quality of the specified musical portion.
A | ABc dcd | B2 e e2 d | c2 a a^ga | f2 d dcB | ABc dcd | B2 e e2 d | 
 c2 a gfe | d3 d2 :: e | f2 f def | g2 B g2 f | e2 e cde | f2 A f2 e | 
 d2 d def | g2 B e2 d | c2 a gfe | d3 d2 :|  
X:1
L:1/8
Q:3/8=100
M:6/8
K:D
 A |"D" ABc dcd |"Em" B2 e e2 d |"A7" c2 a a^ga |"D" f2 d"G" dcB |"D" ABc dcd |"Em" B2 e e2 d | 
"A7" c2 a gfe |"D" d3 d2 :: e |"Bm" f2 f def |"Em" g2 B g2 f |"A7" e2 e cde |"D" f2 A f2 e | 
"Bm" d2 d def |"Em" g2 B e2 d |"A7" c2 a gfe |"D" d3 d2 :|  