Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:D
['A A>Bc def gba gfe fdB Ade', 'd2 g f2 g a3 b2 g']  
X:1
L:1/8
M:6/8
K:D
 A | A>Bc def | gba gfe | fdB Ade | fge d2 :: g | f2 g a3 | b2 g afd | f>ga bc'd' | d>ed cBA | 
 gbg faf | ede fdB | dcB Aag | fge d2 :|  