Construct a musical work that combines the specified alphabet-based pattern with the given melodic theme.
X:1
L:1/8
M:6/8
K:Bb
['F F2']  
X:1
L:1/8
M:6/8
K:Bb
 F | F2 FFGA | B3 G2 G | G2 GBAG | F2 B D2 F | F2 ECCA | B2 d d2 B | c2 cAGA | B3 z2 |]  