Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:4/4
K:A
['A,CEA c2 BA BEGB d2 cB', 'aece a2 ga fdBd f2 ed']  
X:1
L:1/8
M:4/4
K:A
|: A2 | A,CEA c2 BA | BEGB d2 cB | cAce aecA | BcdB AGFE | A,CEA c2 BA | BEGB d2 cB | Acea gfdB | 
 A2 c2 A2 :: (3efg | aece a2 ga | fdBd f2 ed | cAce aecA | BcdB AGFE | aece a2 ga | fdBd f2 ed | 
 Acea Begb | gefg a2 :|  