Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/4
M:4/4
K:D
['A B A/G/F/E/', 'f d d']  
X:1
L:1/4
M:4/4
K:D
 A | d3/2 d/ A B | A/G/F/E/ D"^a." F | E E [cE] [cE] | [BE] [BE] [cE] A | d d A B | A/G/F/E/ D D | 
"^b." E E c B/c/ | d2 d :: A | d3/2 d/ f f | d d f3/2 f/ | g g/f/ e"^c." c/d/ | e/d/c/B/ A A | 
 d3/2 d/ f f | d d f3/2 f/ | g g/f/ e c/e/ | f d d :|"^Var:""^a." D/D/ ||"^b." E3/2 E/ |"^c." c |]  