Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:2/2
K:D
['d2 fa', 'D2 gfed gfed (3edc BG AB ed']  
X:1
L:1/8
M:2/2
K:D
 d2 fa d2 fa | gb ed ce AG | FA dA Bgfe | fdec d2 D2 :: gfed gfed | (3edc BG AB ed | ceaf edcB | 
 Afec d2 D2 :|  