Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:D
['Adde f2', 'a2 af g2 ge']  
X:1
L:1/8
M:2/2
K:D
 Adde f2 ed | f2 ed ge c2 | Adde f2 eg | afge d2 D2 :: a2 af g2 ge | f2 ed ge c2 | a2 af g2 ge | 
 face d2 D2 :|  