Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/8=280
M:2/4
K:D
['FA FD', 'D e fd dB Ad de fd']  
X:1
L:1/8
Q:1/8=280
M:2/4
K:D
 A/G/ | FA FD | GB BA | FA FD | FE EG | FA FD | GB BA | Bd AG | FD D :| e | fd dB | Ad de | fd ag | 
 fe eg | fd dc | Bd dB | AB BG | FD D :|  