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:3/4
K:D
['fe d2 FG AB', 'dA B2 G2 ef']  
X:1
L:1/8
M:3/4
K:D
 fe | d2 FG AB | A2 GF ED | G2 BA GF | E3 g fe | d2 FG AB |1 A2 FA DF | GB Eg ec | d4 :|2 
 A2 dc BA | BD GB cA | d4 || fg | af dc dA | B2 G2 ef | g2 ba gf | e4 fg | af dc dA | B2 G2 ef | 
 gf ed ce | d4 :|  