Construct a musical work that combines the specified alphabet-based pattern with the given melodic theme.
X:1
L:1/8
M:4/4
K:G
['G2 (BG)', 'dgbd BGGB Acfc ABcA']  
X:1
L:1/8
M:4/4
K:G
 G2 (BG) dGBG | FGAc BGAF | G2 (BG) dGBG | cBAG FDDF | B2 (BG) dGBG | F2 (AF) cFAF | G2 (BG) dGBd | 
 cBAGFDDc || dgbd BGGB | Acfc ABcA | GBdB BGGB | cBAG (FD) D2 | dgbd BGGB | Acfc ABcA | BdgB BcdB | 
 cBAG FDDF ||  