Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:6/8
K:G
['g2 g g>fe f2 g a>ba g>ag', 'G2) B>cd e2 d g2 d']  
X:1
L:1/8
M:6/8
K:G
|: g2 g g>fe | f2 g a>ba | g>ag g>fe | d2 c (B G2) :: B>cd e2 d | g2 d (B G2) | B>cd e2 d | 
 g2 d (c A2) | B>cd efd | g>fe dec | B>AB (A2 G) | G6 :|  