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:4/4
K:Bb
['F2 F3']  
X:1
L:1/8
M:4/4
K:Bb
 F2 | F3 D F2 B2 | F4 D2 F2 | F3 FGFGA | B4 z2 d2 | c2 z cdcBc | d4 B2 d2 | c3 C C2 D=E | 
 F4 z2 F2 | c3 cBAGA | B4 F2 F2 | e3 edcde | c4 z2 F2 | d3 d c2 c2 | B3 A G2 c2 | B3 BBAGA | 
 B4 z2 |]  