Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
M:4/4
K:Gmin
['B2 B,2 (3dcB (3AGF E2 g2{a} g2', '(3CB,A, B,DFB dgba (3gag ^fa']  
X:1
L:1/8
M:4/4
K:Gmin
 dc | B2 B,2 (3dcB (3AGF | E2 g2{a} g2 fe | (3ded Bd cBAB | Bbag (3fgf (3edc | B2 B,2 (3dcB (3AGF | 
 E2 g2{a} g2 fe | (3ded Bd cBAB | (3cdc BA B2 || (3CB,A, | B,DFB dgba | (3gag ^fa g2 CB, | 
 A,CFA cfag | (3fgf =eg f2 (3CB,A, | B,DFB dgba | (3gag ^fa ga (3bag | fbag (3fgf (3edc | 
 (3BcB Ac B2 ||  