Construct a harmonious chain of chord progressions that enhance the presented musical piece.
(3EFG | A2 AG Aceg | a2 ag aece | fdBA GABd | (3cBA BA GAFG | 
 EAAG Aceg | a2 ag aece | fdBA GABd | cABG A2 :: (3Bcd | e2 a2 ec A2 | 
 d2 b2 BcdB | gbeg begb | ac'ea c'eac' | e'2 c'2 a2 e2 | f2 df eAcA | 
 Baga ecBc | dBGB A2 :|  
X:1
L:1/8
M:2/2
K:A
 (3EFG |"A" A2 AG"E7" Aceg |"A" a2 ag aece |"D" fdBA"E7" GABd |"B7" (3cBA BA"E7" GAFG | 
"A" EAAG"E7" Aceg |"A" a2 ag aece |"D" fdBA"E7" GABd |"E7" cABG"A" A2 :: (3Bcd |"A" e2 a2 ec A2 | 
"Bm" d2 b2 BcdB |"E7" gbeg begb |"A" ac'ea c'eac' |"A" e'2 c'2 a2 e2 |"D" f2 df"A" eAcA | 
"B7" Baga"E7" ecBc |"E7" dBGB"A" A2 :|  