Construct a harmonious chain of chord progressions that enhance the presented musical piece.
"^A" |: D2 FE DEFA | dcde fdAF | G2 BG |1 F2 AF | EFGE DCB,A, :|2 FEDF | 
 EDCE D4"^B" :: A,B,CD EFGE | FDEF GABc | dBBA Bcde | f2 gf e3 c || 
 d2 fd c2 ec | BcdB AFDF | G2 BG FEDF | EDCE D4 :|  
X:1
L:1/8
M:2/2
K:D
"^A" |:"D" D2 FE DEFA | dcde fdAF |"G" G2 BG |1"D" F2 AF |"Em" EFGE"A" DCB,A, :|2"D" FEDF | 
"A" EDCE"D" D4"^B" ::"A" A,B,CD EFGE |"D" FDEF GABc |"G" dBBA"Bm/F#" Bcde |"Em" f2 gf"A" e3 c || 
"D" d2 fd"A" c2 ec |"G" BcdB"D" AFDF |"G" G2 BG"D" FEDF |"A" EDCE"D" D4 :|  