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:2/4
K:D
['d2 f2 ec A2 BcdB A4 GEeE', 'c d4 GB GE FA d2']  
X:1
L:1/8
M:2/4
K:D
 d2 f2 | ec A2 | BcdB |"^tr" A4 | GEeE | FDfD | [B,B]dcB |{B}"^tr" A4 :: Ac ed | cecA |"^tr" B3 c | 
"^tr" d4 | GB GE | FA d2 | BGF"^tr"E | D4 :|  