Construct a harmonious chain of chord progressions that enhance the presented musical piece.
"^A" A2 | DDFA BA(3Bcd | DDFA d2 (3cd^d | eAce fe(3f^ga | 
 (3efe(3dcB (3ABA(3GFG | ADFA BA(3Bcd | DDFA d2 (3cd^d | eAce faec | 
 dedc d2 :|"^B" (3cd^d | eAce fe(3f^ga | eAce fe(3f^ga | ea^gf edcB | 
 (3Ace(3aec A2 G2 | (3FEDFA dfaf | gBdg bbag | (3fafdf edce | df(3edc d2 :|  
X:1
L:1/8
M:4/4
K:D
"^A" A2 |"D" DDFA"G" BA(3Bcd |"D" DDFA d2 (3cd^d |"A" eAce"D" fe(3f^ga | 
"Em" (3efe(3dcB"A7" (3ABA(3GFG |"D" ADFA"G" BA(3Bcd |"D" DDFA d2 (3cd^d |"A" eAce"D" faec | 
"A7" dedc"D" d2 :|"^B" (3cd^d |"A" eAce"D" fe(3f^ga |"A" eAce"D" fe(3f^ga |"A" ea^gf"E7" edcB | 
"A" (3Ace(3aec"A7" A2 G2 |"D" (3FEDFA dfaf |"G" gBdg bbag |"D" (3fafdf"A" edce |"D" df(3edc d2 :|  