Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
['dBB BGG cAA AFD DGG FAA', 'gfe dcB edc Bcd']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
 dBB BGG | cAA AFD | DGG FAA | GBB ABc | dBB BGG | cAA AFD | DGG FAA | BGG G3 :: gfe dcB | 
 edc Bcd | ecA dBG | GFG AFD | gfe dcB | edc Bcd | efg fed | ed^c d3 :|  