Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
Q:1/8=160
M:9/8
K:D
['A2 F FEF d2 A', '', 'd2 B']  
X:1
L:1/8
Q:1/8=160
M:9/8
K:D
 d/B/ | A2 F FEF d2 A | B2 e e2 d cBA | A2 F FEF d2 A | BdB AFE D2 :| g |: f2 d ded ded | 
 e2 c cdc cdc |1 d2 B BcB BcB | c2 A ABA ABA :|2 d2 B c2 A Bcd | ecA ABc d3 ||  