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
['FA A2 FADF ADFA BAFD', 'FA A2 FADF', 'D2 dffe fgfe dfed BAFB Acec fcec', 'D2 dffe fgfe dfed BAFB Acec acec']  
X:1
L:1/8
M:2/2
K:D
 FA A2 FADF | ADFA BAFD | GBBA B3 G | ABdf edBA | FA A2 FADF | ADFA BAFD | GB B2 ADFD | 
 EFGE FD D2 || FA A2 FADF | ADFA BAFD | dB B2 AB B2 | ABdf edBA | FA A2 FADF | Adcd BAFD | 
 GB B2 ADFD | EFGE FD D2 |] dffe fgfe | dfed BAFB | Acec fcec | B3 A BAFA | dffe f3 e | dcdA BAFD | 
 GB B2 ADFD | EFGE FD D2 || dffe fgfe | dfed BAFB | Acec acec | B3 A BAFA | dffe f3 e | dcdA BAFD | 
 GB B2 A2 FD | EFGE FD D2 |]  