Craft a piece of music that integrates both the suggested theme and letter-based structure.
X:1
L:1/8
M:2/2
K:D
['GBAG GBAG']  
X:1
L:1/8
M:2/2
K:D
|:"D" dAFA"G" GBAG |"D" FEDF"G" GBAG |"D" FDFD"G" GEGE |"D" FDFD"A" EABc |"D" dAFA"G" GBAG | 
"D" FAFA"G" GBAG |"D" FdBg"A" fdec |"D" d2 d2 d4 ::"A" ecAc ecge |"D" fdAd fdaf | 
"A" ecAc"A7" ecge |"E7" edcB"A" A4 |"G" BGDG BGdB |"D" AFDF AFdA |"G" BGdB"A" AFGE |"D" D2 D2 D4 :|  