Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:6/8
K:Gdor
['B2 c', 'AGF G2 A B2 c dBG G2']  
X:1
L:1/8
M:6/8
K:Gdor
 GFD B2 c | dBG GFD | G2 A B2 c | eBG G2 B | BFD B2 c | dBG AGA | FAc fed |1 cAF FGA :|2 
 cAF F2 c || dfd cdc | BdB{B} AGF | G2 A B2 c | dBG G2 c | dfd cfc | BdB AGA | FAc fed | cAF FAc | 
 dd cdc | BdB{B} AGF | G2 A B2 c | dBG G2 B | dBd fed | cdB AGA | FAc fed | cAF FAc ||  