Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
Q:1/2=90
M:4/4
K:D
['d2 Ad', "a/b/4c'/4 d'afa gbeg"]  
X:1
L:1/8
Q:1/2=90
M:4/4
K:D
 f | d2 Ad BdAd | GdFd Eeef | d2 Ad Bbag | faeg fdd :| a/b/4c'/4 | d'afa gbeg | 
 fada eAA a/b/4c'/4 | d'afa gbeg | faeg fdd a/b/4c'/4 | d'afa gbeg | fadf eAAa | b>abc' d'c'ag | 
 faeg fdd |]  