Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
Q:1/2=104
M:4/4
K:G
['GG/G/ BG', 'G2 (3gag b2 (3efe g2 d>ed>B A<F']  
X:1
L:1/8
Q:1/2=104
M:4/4
K:G
 GG/G/ BG dGBG | GG/G/ BG d3 B | (3cdc e>c (3BcB d>B | A>Bc>A GFED | GG/G/ BG dGBG | 
 GG/G/ BG d3 B | cc/c/ e>c BB/B/ d>B | cAGF G2 G2 :| (3gag b2 (3efe g2 | d>ed>B A<F D2 | 
 (3gag bg (3efe ge | d>Bc>A BB/B/ B2 :|  