Create a musical composition using the given alphabetical pattern and melodic theme.
X:1
L:1/8
Q:1/4=140
M:4/4
K:G
['G2 BD', 'B2 Bd cBAG']  
X:1
L:1/8
Q:1/4=140
M:4/4
K:G
 G2 BD G2 BD | GBAG E2 D2 | DEFG A2 G2 | FGEF DEFD | G2 BD G2 BD | GBAG E2 D2 | DEFG AGFE | 
 DEFA G4 :| B2 Bd cBAG | FAEA DEFD | B2 Bd cBAG | FAGF GFED | B2 Bd cBAG | FAEA DEFD | FADA EADA | 
 DEFA G4 :|  