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
M:4/4
K:G
['(3DEF G2 GG Bded BdBG DGBG ABAG', 'ef g2 g g3 ag fdAd f2', '(3DEF GGBG GcGG BGGc GGBG FGAB cDEF']  
X:1
L:1/8
M:4/4
K:G
|: (3DEF | G2 GG Bded | BdBG DGBG | ABAG FDEF | GABc d2 (3DEF | G2 GG Bded | BdBG DGBG | 
 ABAG FDEF | GBAF G2 :: ef | g2 g g3 ag | fdAd f2 gf | ecAG FDEF | GABc d2 ef | g2 g g3 ag | 
 fdAd f2 gf | ecAG FDEF | GBAF G2 :: (3DEF | GGBG GcGG | BGGc GGBG | FGAB cDEF | GABc d2 (3DEF | 
 GGBG GcGG | BGGc GGBG | FGAB cDEF | GBAF G2 :|  