Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:G
['d>GB>g d>G B2 (c/d/e)', 'g2 d>g']  
X:1
L:1/8
M:4/4
K:G
 (B/c/) | d>GB>g d>G B2 | (c/d/e) d>B c<A A(B/c/) | d>GB>g d>G B2 | (c/d/e) A>d B<G G :: f | 
 g2 d>g (e/f/g) d>B | (c/d/e) d>B c<A A>f | g2 d>g (e/f/g)d>B | (c/d/e) A>d B<G G :|  