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:2/4
K:D
['d c d', 'A G F']  
X:1
L:1/4
M:2/4
K:D
 d | c d A B | A/B/A/G/ F d | c d F B | A3 :: F/G/ | A/B/A/G/ F A | G F E E/F/ |1 G/A/G/F/ E B | 
 A G F :|2 G/A/G/F/ E F | D3 ||  