Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:4/4
K:C
['G,C (3CCC G,CEC', 'ECA,C _E2 (3EEE _BEGE _EF(3FFF cFAF FG']  
X:1
L:1/8
M:4/4
K:C
|: G,C (3CCC G,CEC | A,C (3CCC A,CFC | G,C (3CCC G,CEC | F3 E DCA,C | G,C (3CCC G,CEC | 
 A,C (3CCC A,CFE | EG,CE FEDC | B,DGF ECA,C :: _E2 (3EEE _BEGE | _EF(3FFF cFAF | FG (3GGG dGBG | 
 GA (3AAA fAcA | AB (3BBB gBdB | Bc (3ccc acga | bagf efgf | edcd c2 CD :|  