Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:2/2
K:D
['A2 d3 c edcB A^GAB ABAF']  
X:1
L:1/8
M:2/2
K:D
|: A2 |"D" d3 c edcB | A^GAB ABAF |"D" DBAF DBAF |"A" G2 E2 E2 A2 |"D" d3 c edcB | A^GAB ABAF | 
"G" DBAF"A7" AGEF |"D" D2 d2 d2 :| f2 |"A" efgf edce |"D" defg a2 fa |"A" ageg"D" gfdf | 
"A" edef e3 f |"A" efgf edce |"D" defg a2 fa |"A" ageg"D" gfdf |"A7" edcB A2 |]  