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:6/4
K:D
['A F D B A2 d c3', 'd c B', 'e c', 'c c', 'F c/ d/ e/ f/ g e', 'G/ A/']  
X:1
L:1/4
M:6/4
K:D
 A | F D B A2 d | c3 A B c | d c B A G F | E3- E2 A | F D B A2 d | c3 A B c | d A d c/d/ e c | 
 d3 D2 || E | C A, C A2 G | F D F B2 c | d c B B2 ^A | B3 c3 | d c B A G F | E/F/G/F/E/D/ C2 A | 
 A F B A2 d | c3 A B c | d A D c/d/ e c | d3 D2 |][M:2/2][K:Amin] g | e c d/c/ B/A/ | G3 g | 
 e c c d | e c c d/e/ | f f/g/ a/g/f/e/ | d g g a | ^f d g f | g G G || a | g f/e/ d/e/ f/g/ | 
 a f f g | c c A d | B G G e | A/B/ c B/c/ d | d/e/ f e/f/ g | a/g/f/e/ d/e/f/g/ | e c c |] 
[M:2/2][K:F] f c A F | c/ d/ e/ f/ g e | f/ g/ a g f | e3/2 d/4 e/4 f4 || f c A F | 
 F/ G/ A/ B/ c A | d/ B/ c/ A/ B/ G/ A/ F/ | E3/2 D/4 E/4 F4 |]  