Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:3/4
K:A
['Ac e2 a2 gf e4 EG B2', 'B6 e^deBGE d2 c4 fedcBA G2 FG']  
X:1
L:1/8
M:3/4
K:A
 Ac e2 a2 | gf e4 | EG B2 d2 | cB A4 | fdfa a2 | ecea a2 | fe d2 c2 | B6 :: e^deBGE | d2 c4 | 
 fedcBA | G2 FG E2 | AA,A,A,Ac | BB,B,B,Bd | c2 BABG | A6 :|  