Construct a musical work that combines the specified alphabet-based pattern with the given melodic theme.
X:1
L:1/8
M:4/4
K:C
['AB c2 dc BA G2 c2 de', 'f2 ef g2 ga gfed c2']  
X:1
L:1/8
M:4/4
K:C
 AB | c2 dc BA G2 | c2 de f2 ef | g2 ga gfed | c2 e2 G2 AB | c2 dc BA G2 | c2 de f2 ef | 
 g2 ga gfed | c2 Bd c4 :: cdef g2 g2 | agge f2 ef | g2 ga gfed c2 e2 G2 AB | c2 dc BA G2 | 
 c2 de f2 ef | g2 ga gfed | c2 B2 c2 :|  