Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:6/8
K:G
['A BAB GBG AFD F2 G AGA', 'FGA BAB GBG AFD F2 G AGA', 'd gfg', 'fga geg fed fed cde fef ded']  
X:1
L:1/8
M:6/8
K:G
 A | BAB GBG | AFD F2 G | AGA fed | cAG FGA || BAB GBG | AFD F2 G | AGA fed | cAF G2 :: d | 
 gfg afd | gfg a2 d | gfg b2 g | a2 g fga || geg fed | fed cde | fef ded | cAF G2 :|  