Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/16
M:2/4
K:Gmin
['(3B,A,G, A,4', 'z2 =FG2G- GA2A- AB2c dBF2 GA2A- A=B2B']  
X:1
L:1/16
M:2/4
K:Gmin
 G,3A,/ (3B,A,G, A,4 | G,>A, (3B,A,G, A,4 | G,A,B,2- B,CD2- | D^FGB AFD2 | G,3A,/ (3B,A,G, A,4 | 
 G,>A, (3B,A,G, A,4 | G,A,B,2- B,CD2- | DBA^F G2 z2 :: =FG2G- GA2A- | AB2c dBF2 | GA2A- A=B2B | 
 =Bc2d ecG2 | Af (3gf=e f_ece | dbfd geBG | F=EFG A_e (3FGA | B2[Fd]2[DB]2 z2 :|  