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:D
['ABAG F2 A2', 'g2 e2']  
X:1
L:1/8
M:4/4
K:D
|: FG | ABAG F2 A2 | f4 d4 | ABAG F2 A2 | f2 f2 d2 f2 | e2 ef g2 fe | d2 de fafd | c2 cd egec | 
 d2 :: fg | a2 g2 e2 ce | g2 f2 d4 | f2 e2 B2 c2 | dcde fefg | a2 g2 e2 ce | g2 f2 d2 c2 | 
 B2 g2 e2 c2 | d2 :|  