Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:G
['G3 B dG G2', 'BddB dBGB', 'dgbg agbg', 'BddB dBGB defg aged']  
X:1
L:1/8
M:4/4
K:G
 G3 B dG G2 | cABG AGEG | DGBG dG (3Bcd | gedc BGAF | G3 B dG G2 | cGBG AGEG | BGAF GEDB | 
 DEGA BG G2 || BddB dBGB | defg aged | BddB dBGB | ABcA BG G2 | BddB dBGB | defg aged | 
 (3Bcd ef g3 e | dBAc BG G2 || dgbg agbg | dgbg ageg | dgbg agbg | dedc BG G2 | dgbg agbg | 
 dgbg ageg | bgaf gedB | dega bg g2 || BddB dBGB | defg aged | BddB d2 ge | dBAc BG G2 | 
 BddB dBGB | defg aged | (3Bcd ef g3 e | dBAc BG G2 ||  