Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:2/4
K:G
['G>A BG EG ED', 'dB G>A']  
X:1
L:1/8
M:2/4
K:G
 D | G>A BG | EG ED | G>A Bd | BA AB | G>A BG | EG ED | BG D/E/ F/G/ | AG G :| B/c/ | dB G>A | 
 BG ED | dB G>A | BA AB/c/ | dB G>A | BG ED | BG D/E/ F/G/ | AG G :|  