Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:6/8
K:G
['GDG B^AB GB/c/d gdB G2 D BdG', 'gfg efg']  
X:1
L:1/8
M:6/8
K:G
 GDG B^AB | GB/c/d gdB | G2 D BdG | DED cc/B/A | G3 BAG | dBd g2 d | efg dBG | cBA G2 :| gfg efg | 
 fag fed | gfg efg | agf g2 f | gfe d>cB | edc B>AG | gg/g/g dBG | cBA G2 :|  