Construct a musical work that combines the specified alphabet-based pattern with the given melodic theme.
X:1
L:1/8
Q:1/2=80
M:2/4
K:G
['G2 GA BG G2 A2 AB cAAB', 'E2 g2 ge dB B2 g2 ga']  
X:1
L:1/8
Q:1/2=80
M:2/4
K:G
 G2 GA | BG G2 | A2 AB | cAAB | cdec | BdcB | AcBA | GE E2 :: g2 ge | dB B2 | g2 ga | be ef | 
 gage | dBBG | AcBA | GE E2 :|  