Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:12/8
K:A
['c2 E E^DE F2 A A2 f', 'A AB c2 e ece f2 a']  
X:1
L:1/8
M:12/8
K:A
|: AB | c2 E E^DE F2 A A2 f | e2 c cBA c2 B B^AB | c2 E E^DE F2 A A2 f | e2 c BcB A3- A :: AB | 
 c2 e ece f2 a a2 f | e2 c- cBA c2 B B^AB | cee ec/d/e faa agf | ecc B^AB =A2 G A- :|  