Construct chordal sequences to boost the harmonious coherence within the specified musical piece.
e2 | A2 (cA) eAfA | eAfA e(cBc) | A2 (cA) eAfA | e(cBc) A(FEF) | A2 (cA) eAfA | 
 eAfA e(cBc) | ABAF Ecd(f | ec)Bc A2 :| (cB) | A2 ce a2 af | efed cdcB | 
 A2 ce a2 ag | gbba gbeg | agae fae(c | dB)cA BAFG | ABAF Ecd(f | 
 ec)Bc A2 :|  
X:1
L:1/8
M:4/4
K:A
 e2 |"A" A2 (cA) eAfA |"A" eAfA e(cBc) |"A" A2 (cA) eAfA |"Bm" e(cBc)"D" A(FEF) |"A" A2 (cA) eAfA | 
"A" eAfA e(cBc) |"A" ABAF Ec"D"d(f | ec)Bc A2 :| (cB) |"A" A2 ce a2 af |"A" efed cdcB | 
"A" A2 ce"F#m" a2 ag |"B7" gbba"E7" gbeg |"A" agae fae(c |"D" dB)cA"E7" BAFG |"A" ABAF"D" Ecd(f | 
"E7" ec)Bc"A" A2 :|  