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
Q:1/4=120
M:2/2
K:Ddor
['flats in FE DEFG A=Bcd =edcd egfe', 'd=efg abga']  
X:1
L:1/8
Q:1/4=120
M:2/2
K:Ddor
"_Two flats in MS" FE | DEFG A=Bcd | =edcd egfe | df=eg fagb | agfe d2 :| A^c | d=efg abga | 
 f=e/f/ gf ecge | d=efg abga | fg=ef dA=B^c | d=efg abga |{g} f=e/f/ gf ecge | dAfd =egba | 
 agf=e d2 |]  