Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/16
M:2/4
K:C
['[G,D]2[CE]2 [CE]2>G2 cBAB', '[Ae]2[Ec]2 [Ec][EB][Ec][Ed] efga']  
X:1
L:1/16
M:2/4
K:C
 [G,D]2[CE]2 [CE]2>G2 | cBAB cBAG | G,2[B,D]2 [B,D]2>A2 | dcBc dcBA | [G,D]2[CE]2 [CE]2>G2 | 
 cBAB [Ec]2cd | [Ae][Bg]2[Bg] [Ba]2gf | [Ae][Ec]2[Ec] [Ec]4 || gf | [Ae]2[Ec]2 [Ec][EB][Ec][Ed] | 
 efga [Bg]2dc | B2[G,G]2 [G,G]FGA | Bcde d2gf | [Ae]2[Ec]2 [Ec][EB][Ec][Ed] | efga g2fg | 
 a2ab aged | [Ec]2[Ec]2 [Ec]2 ||  