Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/16
Q:1/8=180
M:2/4
K:D
['efec defg faaf', 'd2 z2 a8- a2>g2 faaf g2e2 f2dd']  
X:1
L:1/16
Q:1/8=180
M:2/4
K:D
 (3(BcB) | A2B2c2e2 | efec defg | faaf g2a2 | afga gedc | BABc e2d2 | efec defg | faaf g2af | 
 gecA d2 :: z2 | a8- | a2>g2 faaf | g2e2 f2dd | efec d2A2 | d2f2 a4- | a6 g2 | faaf g2c2 | 
 d2f2d2 :|  