Compose a piece of music that follows both the given musical theme and the letter-based structure provided.
X:1
L:1/8
M:4/4
K:G
['(3GFE D2 G>B A2 g>e d2 (3cBA', 'A>GE<G d>ge<g d<g (3bag a2 a>b g2']  
X:1
L:1/8
M:4/4
K:G
|: (3GFE | D2 G>B A2 g>e | d2 (3cBA B<GE>G | D>G (3GGB (3ABA (3gfe |1 d>Bc<A B>G :|2 
 d>Bc<A B<G G2 || g2 e>g d2 B>d | (3cBA (3BAG A>GE<G | d>ge<g d<g (3bag | a2 a>b g2 g>a | 
 b>g (3efg d>g (3Bcd | c2 B>G A<G E2 | D>GG>B A2 g>e | d>B (3cBA G2 ||  