Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:6/8
K:G
['GGG AGE DGG BGd BGE DGG BcA', 'BGG dBG GBd dBG cAA FGA BcA', 'BGG DGG FGE DGG GDD BDG BcA']  
X:1
L:1/8
M:6/8
K:G
|: GGG AGE | DGG BGd | BGE DGG | BcA AGF | FGA Ddc | BcA BGG :: dBG GBd | dBG cAA | FGA BcA | 
 FGA DGG | AGE Ddc | BcA BGG :: DGG FGE | DGG GDD | BDG BcA | FGA ABc | ddc BcA | BGG FGA :|  