Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/16
M:2/4
K:G
['GABc d2ef g2dc (3BdBG2 FGAB', 'BGAFG2 d2dd d2d2 defg agdB c2cc c2c2']  
X:1
L:1/16
M:2/4
K:G
 GABc d2ef | g2dc (3BdBG2 | FGAB cedc | B2(AG) (3FAFD2 | GABc d2ef | g2dc (3BdBG2 | FGAB cedc | 
 BGAFG2 :: d2dd d2d2 | defg agdB | c2cc c2c2 | cBAG FAFD | GABc d2ef | g2dc (3BdBG2 | FGAB cedc | 
 BGAF G2 :|  