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
Q:3/4=90
M:6/4
K:Bb
['f d', 'f d B']  
X:1
L:1/4
Q:3/4=90
M:6/4
K:Bb
 a | b f d g e c | f d B c A F | B G E D d c | c2 B B2 || c | A c A f d B | d f a f d B | 
 e d e d g A | A2 G G2 g | f d B e3/2 f/ g | G c G A3/2 G/ F | a g a b B c | c2 B B2 |]  