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:9/8
K:D
['DFF DFF', 'afd def']  
X:1
L:1/8
M:9/8
K:D
|: DFF DFF A,3 | DFF DFF G3 | DFF DFF A,3 | agf e2 d d3 :: afd def A3 | afd def g3 | afd def A3 | 
 agf e2 d d3 :|  