Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
['gf e2 dB ABAG', 'e2 ge edBd']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
 gf | e2 dB ABAG | EAAG A2 gf | e2 dB ABAG | EDEF G2 :| Bd | e2 ge edBd | eA A2 eA A2 | 
 e2 ge edBd | d2 ef g2 :|  