Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:4/4
K:G
['G>A (3GFE D>CB,>D G>DG>A B>dg>f e>dc>B A>BG>A', 'G2 B>c d3 e d>BG>D G>Bd>e d2']  
X:1
L:1/8
M:4/4
K:G
 (3DEF | G>A (3GFE D>CB,>D | G>DG>A B>dg>f | e>dc>B A>BG>A | B>AG>F E>DE>F | G>A (3GFE D>CB,>D | 
 G>DG>A B>dg>f | e>dc>B A>BG>A | B>GG>F G2 :: B>c | d3 e d>BG>D | G>Bd>e d2 g>f | e2 g>e d2 B>d | 
 c>AB>G A>F (3DEF | G>A (3GFE D>CB,>D | G>DG>A B>dg>f | e>dc>B A>BG>A | B>GG>F G2 :|  