Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:2/4
K:G
['[BG]3 B BcBA', 'gf/e/dc [BG]ddd [BG]ddB cBAF']  
X:1
L:1/8
M:2/4
K:G
"G" DGGB |"C" AGAc |"G" BAGA | DGGB |"C" AGAc |"G" BA G2 |"C" efge |"G" d2 Bd |1"C" cBAc | 
"G" BA G2 :|2"C" cBAF ||33 G4 G,4 |]: [BG]3 B | BcBA | GABG |"D" DFAF | DFAB |"C" cBAG | 
"G" [BG]3 B | BcBA |"D" DFAF |"G" [GG,]4 :: [BG]ddd | [BG]ddd | [BG]def | gf/e/dc | [BG]ddd | 
 [BG]ddB |"C" cBAF |"G" [GG,]4 :|  