Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
Q:1/2=100
M:4/4
K:C
['c3 e dB G2 A3 c BG', 'C4 cggc BggB AffA GeeG FddF EccE', 'c4 geca fdBg ecAf dBGe cAFd BGEe']  
X:1
L:1/8
Q:1/2=100
M:4/4
K:C
 c3 e dB G2 | A3 c BG E2 | F3 A GE c2 | F2 G2 C4 |: cggc BggB | AffA GeeG | FddF EccE | D2 B2 c4 :: 
 geca fdBg | ecAf dBGe | cAFd BGEe | a2 g>f e4 :|  