Construct a musical work that combines the specified alphabet-based pattern with the given melodic theme.
X:1
L:1/8
M:3/4
K:Bb
['F>B d2 d2 g>f e2 e2 F>Ac>Agf', 'F>Bd>Bg>f e>dc>BA>G F>ED>CB,>A,']  
X:1
L:1/8
M:3/4
K:Bb
 F>B d2 d2 | g>f e2 e2 | F>Ac>Agf | dd'c'bag | F>B d2 d2 | g>f e2 e2 | F>Ac>Agf | [Bb][Bb] z2 :: 
 F>Bd>Bg>f | e>dc>BA>G | F>ED>CB,>A, | G>F D2 D2 | F>Bd>Bg>f | e>dc>BA>G | F>ED>CB,>A, | 
 B,2 B,2 z2 :|  