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:6/8
K:Dmix
['', 'F2 G ABc ded cAG', '', 'g fed cde fed cAG']  
X:1
L:1/8
M:6/8
K:Dmix
 A/G/ |: F2 G ABc | ded cAG | FGA cAG | FGA A2 G | F2 G ABc | ded cAG | FDF GAG | FDF G2 :| g |: 
 fed cde | fed cAG | FGA cAG | FGA A2 g | fed cde | fed cAG | FDF GAG | FDF G2 :|  