Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:6/8
K:G
['d3 BdB', 'gag gdB', 'dBG G2 B']  
X:1
L:1/8
M:6/8
K:G
 d3 BdB | GBd gdB | d3 BdB | A2 B c2 e | d3 BdB | GBd gdB | cac BgB | A2 B c2 e :| gag gdB | 
 gag gbg | gag gdB | A2 B c2 e | gbg ac'a | gbg fgf | g>fe d>cB | A2 B c2 e :| dBG G2 B | dBG Bdg | 
 dBG G2 B | A2 B c2 e | dBG GBd | g>fe d>cB | cac BgB | A2 B c2 e :|  