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:Bb
['f d>c BA |{A} B3 f ga', 'f d>c']  
X:1
L:1/8
M:2/4
K:Bb
 f | d>c BA |{A} B3 f | ga ba | g2 f2 | ga bg | fa be | df ed | c3 :| f | d>c =B_a | _a2 gf | 
 ed c=B | c3 e | A>G Fg | g2 fB | A/B/c/d/ ed | c3 f | d>c Bb | ag fe | dc/B/ FA | B3 :|  